Restructure modules/shared and update all imports

- Delete 2024-12-rework/ folder
- Rename modules/hosts/common to modules/shared, then split into:
  - modules/shared/home/general
  - modules/shared/home/linux
  - modules/shared/nixos
- Update all import paths throughout the codebase
- Update lib/*.nix to use new paths
- Fix hardcoded /Users/${username} to use config.home.homeDirectory
- Update README and examples/flake-structure.nix

modules/hosts/common/files/nvim/lua/disabled/themes/dracula.lua

@@ -1,8 +0,0 @@
-return {
-  "Mofiqul/dracula.nvim",
-  lazy = false,
-  priority = 1000,
-  config = function()
-    vim.cmd.colorscheme("dracula")
-  end,
-}