Enable PlutusTx.Eq code generation plus massive Nix flake-partsify effort

[bladyjoker]

Closes #87 #110

This was a lot! @szg251 find it in your heart to forgive me for this PR :pray:

DONE:

• Enabled generation of PlutusTx.Eq.Eq class implementations.
• Reworked the config lbg argument to be mergeable (Semigroup <> basically).
• flake-parts-ified the repo entirely.
• Reworked the lbf-nix to make it more robust.
• Added deadnix.

TODO:

• Update documentation to reflect to new tools (cc @jaredponn).
• Make doc chapter on 'Development' (updating, settings.nix, pre-commit.nix, pkgs.nix, hercules.nix etc).
• Implement lbf-prelude-to-purescript and lbf-plutus-to-purescript clis.
• Implement devShells with PlutusTx, CTL and other environments such that users can conveniently play with lbf-prelude... and lbf-plutus... clis.
• Configure nil Nix language server.