Switch to `uv2nix` #3566

Job	Run time
Test + Coverage	3m 19s
Backup process	3m 23s
Formatting	2m 5s
Compile Scss	2m 10s
Linter	2m 37s
MyPy	2m 7s
Test (shuffled order)	2m 49s
Build nix environment on MacOS	3m 31s
Render Html pages	2m 34s
Test Typescript	2m 30s
	27m 5s

Provide feedback