deleted shell.nix as all scripts are ported already

shell.nix

@@ -1,55 +0,0 @@
-let
-    mozillaOverlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
-    pkgs = import <nixpkgs> {overlays = [mozillaOverlay];};
-in with pkgs;
-let
-    migen = callPackage ./nix/migen.nix {};
-    openocd = callPackage ./nix/openocd.nix {};
-    rustPlatform = callPackage ./nix/rustPlatform.nix {};
-    itm = callPackage ./nix/itm.nix {inherit rustPlatform;};
-
-    runOpenOcdBlock = writeShellScriptBin "run-openocd-block" ''
-        openocd -f openocd/openocd.cfg
-    '';
-
-    openocdFlash = writeShellScriptBin "openocd-flash" ''
-        openocd -f openocd/openocd.cfg -f openocd/main.cfg
-    '';
-
-    publishMqtt = writeShellScriptBin "publish-mqtt" ''
-        mosquitto_pub -h localhost -t $1 -m "$2" -d
-    '';
-
-    openOCDFlashCustomised = writeShellScriptBin "openocd-flash-customised" ''
-        python3 flash.py $1 $2 $3 $4
-        openocd -f openocd/openocd.cfg \
-                -c "init 
-                    reset init 
-                    halt 
-                    stm32h7x mass_erase 1 
-                    flash write_image erase target/thumbv7em-none-eabihf/release/humpback-dds 
-                    flash write_image flash_config.bin 0x081e0000 bin 
-                    reset run 
-                    shutdown"
-    '';
-
-in
-    stdenv.mkDerivation {
-        name = "Humpback-DDS";
-        buildInputs = with rustPlatform.rust; [
-            (pkgs.python3.withPackages(ps: [ migen ]))
-            pkgs.yosys
-            pkgs.nextpnr
-            pkgs.icestorm
-            pkgs.gdb
-            pkgs.mosquitto
-            openocd
-            rustc
-            cargo
-            itm
-            runOpenOcdBlock
-            openocdFlash
-            publishMqtt
-            openOCDFlashCustomised
-        ];
-    }