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readme: update CI links, build/dev instructions

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MQTT-controlled 4-channel DDS signal generator using Urukul, Humpback and STM32 NUCLEO.
- [Continuous Integration](https://nixbld.m-labs.hk/job/stm32/stm32/humpback-dds)
- [Download latest firmware build](https://nixbld.m-labs.hk/job/stm32/stm32/humpback-dds/latest/download-by-type/file/binary-dist)
- [Continuous Integration](https://nixbld.m-labs.hk/job/mcu/humpback-dds/humpback-dds)
- [Download latest firmware build](https://nixbld.m-labs.hk/job/mcu/humpback-dds/humpback-dds/latest/download-by-type/file/binary-dist)
## Nix commands
Start nix shell before anything.
Humpback-DDS firmware is packaged using the [Nix](https://nixos.org) Flakes system. Install Nix 2.4+ and enable flakes by adding ``experimental-features = nix-command flakes`` to ``nix.conf`` (e.g. ``~/.config/nix/nix.conf``).
Once you have Flakes enabled, you can use ``nix build`` to build the firmware.
Alternatively, you can develop and build it within Nix shell:
```shell
nix-shell
nix develop
python fpga/fpga_config.py
cargo build --release
```
**(For users who had completed the [networking setup](##networking-setup-for-first-time-user))** Flash firmware onto STM32 NUCLEO-H743ZI2 using OpenOCD.