chore: move semi-secrets to separate flake

feat: add auto regenerated nix-index-database

feat: add nil nix lsp to devshell

chore: update to nixos-unstable

feat: update environment for non-NixOS

feat: add vscodium with extensions

Use custom doom emacs setup instead of nix-community/nix-doom-emacs[1;5D

fix: fix issues

fix: fix issues

feat: add initial configurations