refactor: combine files to align with plugin organization and add more comments

lua/lazy_setup.lua

@@ -13,6 +13,7 @@ require("lazy").setup({
   { import = "community" },
   { import = "plugins" },
 } --[[@as LazySpec]], {
+  -- Configure any other `lazy.nvim` configuration options here
   install = { colorscheme = { "astrodark", "habamax" } },
   performance = {
     rtp = {