refactor: modularize the configuration

chore: remove unnecessary code, use modules instead of imports, split files

feat: doom emacs updates

feat: download doom emacs on activation

fix: remove doom installation from activation, the user will install

feat: do not sync doom every time

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

fix: fix issues

fix: fix issues

feat: add initial configurations