Fix broken links

Signed-off-by: Egor Savkin <es@m-labs.hk>

content/about-us/jobs.md

@@ -73,7 +73,7 @@ We post specific vacancies on job boards such as Indeed.com, but if you think yo
 
 {% layout_centered_content(min_width=true) %}
 
-Our main office is located in the center of Hong Kong, a cosmopolitan city with world-class infrastructure, many cultural and social events, and <a href="https://www.discoverhongkong.com/eng/see-do/great-outdoors/hikes/index.jsp" rel="noopener noreferrer" target="_blank">beautiful natural scenery</a>. It has a separate system from mainland China, where, for example, communications are unrestricted, taxes are low, and customs tariffs virtually inexistent. Hong Kong is located next to Shenzhen, a city with <a href="https://www.wired.co.uk/video/shenzhen-full-documentary" rel="noopener noreferrer" target="_blank">a bustling tech scene</a>, and where many of the world's electronic gadgets are designed and manufactured.
+Our main office is located in the center of Hong Kong, a cosmopolitan city with world-class infrastructure, many cultural and social events, and <a href="https://www.discoverhongkong.com/eng/see-do/great-outdoors/hikes/index.jsp" rel="noopener noreferrer" target="_blank">beautiful natural scenery</a>. It has a separate system from mainland China, where, for example, communications are unrestricted, taxes are low, and customs tariffs virtually inexistent. Hong Kong is located next to Shenzhen, a city with <a href="https://www.wired.com/video/watch/shenzhen-the-silicon-valley-of-hardware-full-documentary-future-cities-wired" rel="noopener noreferrer" target="_blank">a bustling tech scene</a>, and where many of the world's electronic gadgets are designed and manufactured.
 
 We also have a location in Manila, Philippines.
 

content/experiment-control/sinara-core.md

@@ -12,7 +12,7 @@ title = "Sinara hardware"
 
 The first ARTIQ core devices used hardware built in-house by physicists (based on a Xilinx KC705 development board with custom FMC cards). To improve the quality, features and scalability of ARTIQ systems, we have been developing the Sinara device family. It provides turnkey control hardware that is reproducible, open, flexible, modular, well-tested, and well-supported by the ARTIQ control software.
 
-The Sinara hardware is in active development, and the latest information is available <a href="https://github.com/sinara-hw" target="_blank" rel="noopener noreferrer">on the wiki of each project's page</a>. Most of the hardware engineering is done at the <a href="http://www.ise.pw.edu.pl/" target="_blank" rel="noopener noreferrer">Institute for Electronics Systems</a> at the Warsaw University of Technology.
+The Sinara hardware is in active development, and the latest information is available <a href="https://github.com/sinara-hw" target="_blank" rel="noopener noreferrer">on the wiki of each project's page</a>. Most of the hardware engineering is done at the <a href="https://www.ise.pw.edu.pl/" target="_blank" rel="noopener noreferrer">Institute for Electronics Systems</a> at the Warsaw University of Technology.
 
 Kasli and EEMs can be ordered now. We can deliver a rack-mountable crate that contains all the cards, is fully tested, and is ready to be connected to your experiment and computer network. Use our [web-based configuration and ordering tool](../place-order), or contact <a href="mailto:sales@m-labs.hk">sales@m-labs.hk</a> with your requirements, and we will establish a quote.
 

content/gateware/m1.md

@@ -15,7 +15,7 @@ The Milkymist One is programmable and customizable at many different levels.
 
 The simplest way one can use a Milkymist One is by affecting MIDI controls to the existing snippets of code (called "patches") that create the effects. The Milkymist One ships with dozens of pre-existing patches.
 
-Creating new patches can be done with a simple programming language based on the <a href="http://www.milkdrop.co.uk/guide.htm" target="_blank" rel="noopener noreferrer">MilkDrop preset format</a>. The Milkymist One device comes with a built-in editor.
+Creating new patches can be done with a simple programming language based on the <a href="https://web.archive.org/web/20130825023759/http://www.milkdrop.co.uk/guide.htm" target="_blank" rel="noopener noreferrer">MilkDrop preset format</a>. The Milkymist One device comes with a built-in editor.
 
 Under the hood, the Milkymist One is like a mini-computer running our Flickernoise video synthesis software.
 
@@ -50,10 +50,10 @@ But we did not stop at open source <em>software</em>. As a matter of fact, when
 ##### Press
 
 - Create Digital Motion (10/02/2012): <a href="http://createdigitalmotion.com/2012/02/milkymist-is-digital-visual-synthesizer-and-processor-built-on-sophisticated-open-source-hardware/">Milkymist is Digital Visual Synthesizer and Processor, Built as Sophisticated Open Source Hardware</a>
-- MikroBitti (03/2012): <a href="http://www.mbnet.fi/artikkeli/lehti/avointa_vj_rautaa_3_2012">Milkymist One -visualisaattori: Avointa vj-rautaa</a> [FI]
+- MikroBitti (03/2012): <a href="https://web.archive.org/web/20140226181735/http://www.mbnet.fi/artikkeli/lehti/avointa_vj_rautaa_3_2012">Milkymist One -visualisaattori: Avointa vj-rautaa</a> [FI]
 - Make Magazine (30/09/2011): <a href="http://blog.makezine.com/2011/09/30/milkymist-one-an-open-source-vj-console-goes-on-sale/">Milkymist One, an Open Source VJ Console, Goes on Sale</a>
 - The Register (28/09/2011): <a href="http://www.theregister.co.uk/2011/09/28/milkymist/print.html">Open-source hardware group puts out vid system-on-a-chip</a>
-- Theory&amp;Practice (22/09/2011): <a href="http://theoryandpractice.ru/seminars/19402-videosintezator-s-otkrytym-kodom-milkymist-one-22-9">Видеосинтезатор с открытым кодом Milkymist One</a> [RU]
+- Theory&amp;Practice (22/09/2011): <a href="https://web.archive.org/web/20160409033154/http://theoryandpractice.ru/seminars/19402-videosintezator-s-otkrytym-kodom-milkymist-one-22-9">Видеосинтезатор с открытым кодом Milkymist One</a> [RU]
 - ETN (17/05/2011): <a href="http://www.etn.se/index.php?option=com_content&view=article&id=53785">Videoeffekter i öppen hårdvara söker partners</a> [SE]
 - Linux-Magazin (28/01/2011): <a href="http://www.linux-magazin.de/NEWS/VJ-System-Milkymist-als-Entwicklerboard-erhaeltlich">VJ-System Milkymist als Entwicklerboard erhältlich</a> [DE]
 - Create Digital Motion (16/08/2010): <a href="http://createdigitalmotion.com/2010/08/milkymist-one-all-in-one-open-source-vj-workstation/">Milkymist One, All-in-One Open Source VJ Workstation</a>
@@ -154,17 +154,17 @@ Milkymist SoC is phased out in favor of the more powerful [MiSoC](../migen).
 
 ##### Flickernoise
 
-Flickernoise is the video synthesis application developed for the Milkymist One and the Milkymist SoC. It renders hardware-accelerated visual effects comparable (and, to some extent, compatible) with those of <a href="http://www.nullsoft.com/free/milkdrop">MilkDrop</a> 1.x, the popular audio visualization plug-in for Winamp.
+Flickernoise is the video synthesis application developed for the Milkymist One and the Milkymist SoC. It renders hardware-accelerated visual effects comparable (and, to some extent, compatible) with those of <a href="https://www.geisswerks.com/milkdrop/">MilkDrop</a> 1.x, the popular audio visualization plug-in for Winamp.
 
 Flickernoise allows the creation of visual patches and their connection with all the interfaces that the Milkymist One provides thanks to a built-in graphical user interface. Let the visuals react to sound and MIDI events, connect a camera and create live phantasmagoric images of yourself...
 
 Flickernoise uses:
 
 - The <a href="http://www.rtems.org">RTEMS</a> real-time operating system.
-- The <a href="http://www.yaffs.org">YAFFS</a> flash filesystem (modified version <a href="http://www.github.com/m-labs/rtems-yaffs2">here</a>).
+- The <a href="https://web.archive.org/web/20151025081338/http://www.yaffs.org/">YAFFS</a> flash filesystem (modified version <a href="http://www.github.com/m-labs/rtems-yaffs2">here</a>).
 - The <a href="http://www.libpng.org">libpng</a>, <a href="http://www.ijg.org">libjpeg</a>, <a href="http://www.ijg.org">openjpeg</a> and <a href="http://jbig2dec.sourceforge.net/">jbig2dec</a> image decompression libraries.
 - The <a href="http://www.freetype.org">freetype</a> font rendering system.
-- The <a href="http://www.mupdf.com">MuPDF</a> library for the online help system.
+- The <a href="https://www.mupdf.com">MuPDF</a> library for the online help system.
 - <a href="http://www.github.com/m-labs/mtk">MTK</a>, a modified version of the <a href="http://www.genode-labs.com/products/fpga-graphics">Genode FX</a> embedded GUI toolkit, which provides all the elements for common user interaction (windows, buttons, etc.).
 - <a href="http://www.github.com/m-labs/liboscparse">liboscparse</a>, a variant of <a href="http://liblo.sourceforge.net/">liblo</a>, for <a href="http://www.opensoundcontrol.org">OpenSoundControl</a> communications.
 

content/gateware/migen.md

@@ -54,7 +54,7 @@ You can find the Migen source <a href="http://github.com/m-labs/migen" target="_
 - <a href="https://www.wdj-consulting.com/blog/migen-port.html" target="_blank" rel="noopener noreferrer">Tutorial "Porting a New Board To Migen"</a> by cr1901
 - <a href="https://lab.whitequark.org/notes/2016-10-18/implementing-an-uart-in-verilog-and-migen/" target="_blank" rel="noopener noreferrer">"Implementing a UART in Verilog and Migen"</a> by whitequark
 - <a href="https://lab.whitequark.org/notes/2016-10-19/implementing-a-simple-soc-in-migen/" target="_blank" rel="noopener noreferrer">"Implementing a simple SoC in Migen"</a> by whitequark
-- <a href="http://blog.lambdaconcept.com/doku.php?id=migen:tutorial" target="_blank" rel="noopener noreferrer">Migen Step by Step Tutorial</a> by LambdaConcept
+- <a href="https://web.archive.org/web/20210416131215/http://blog.lambdaconcept.com/doku.php?id=migen:tutorial" target="_blank" rel="noopener noreferrer">Migen Step by Step Tutorial</a> by LambdaConcept
 
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content/gateware/nmigen.md

@@ -28,7 +28,7 @@ nMigen itself provides the core language, and is complemented by a number of ext
 
 ##### Documentation
 
-Documentation for nMigen and its external components is rather limited at the moment. However, you can follow the <a href="http://blog.lambdaconcept.com/doku.php?id=nmigen:tutorial" target="_blank" rel="noopener noreferrer">tutorial by LambdaConcept</a>, and another <a href="https://github.com/RobertBaruch/nmigen-tutorial" target="_blank" rel="noopener noreferrer">tutorial by Robert Baruch</a>, as well as his video series on building a 6800 CPU on an FPGA with nMigen: <a href="https://www.youtube.com/watch?v=85ZCTuekjGA" target="_blank" rel="noopener noreferrer">part 1</a> <a href="https://www.youtube.com/watch?v=AQOXoKQhG3I" target="_blank" rel="noopener noreferrer">part 2</a> <a href="https://www.youtube.com/watch?v=aLQqOxnVMOQ" target="_blank" rel="noopener noreferrer">part 3</a> <a href="https://www.youtube.com/watch?v=xqMtyCu4lME" target="_blank" rel="noopener noreferrer">part 4</a>.
+Documentation for nMigen and its external components is rather limited at the moment. However, you can follow the <a href="https://web.archive.org/web/20210518042504/http://blog.lambdaconcept.com/doku.php?id=nmigen:tutorial" target="_blank" rel="noopener noreferrer">tutorial by LambdaConcept</a>, and another <a href="https://github.com/RobertBaruch/nmigen-tutorial" target="_blank" rel="noopener noreferrer">tutorial by Robert Baruch</a>, as well as his video series on building a 6800 CPU on an FPGA with nMigen: <a href="https://www.youtube.com/watch?v=85ZCTuekjGA" target="_blank" rel="noopener noreferrer">part 1</a> <a href="https://www.youtube.com/watch?v=AQOXoKQhG3I" target="_blank" rel="noopener noreferrer">part 2</a> <a href="https://www.youtube.com/watch?v=aLQqOxnVMOQ" target="_blank" rel="noopener noreferrer">part 3</a> <a href="https://www.youtube.com/watch?v=xqMtyCu4lME" target="_blank" rel="noopener noreferrer">part 4</a>.
 
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