Future possible improvements for nix flake

[catornot]

• increase cache size
• fix clangd
• improve usage (aka look into removing the submodule requirement)
• incremental builds with ninja
• clang-format
• cmake formatting

[catornot]

incremental builds w/ ninja seemingly are possible in derivations : https://github.com/pdtpartners/nix-ninja

tho it requires features which are not widely supported across the two main nix compilers (lix dropped recursive-nix feature iirc) and it's just an extra dependency in the flake.