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/tokyonight.lua

@@ -1,10 +0,0 @@
-return {
-  -- the colorscheme should be available when starting Neovim
-  "folke/tokyonight.nvim",
-  lazy = false, -- make sure we load this during startup if it is your main colorscheme
-  priority = 1000, -- make sure to load this before all the other start plugins
-  config = function()
-    -- load the colorscheme here
-    vim.cmd.colorscheme "tokyonight-storm"
-  end,
-}