Refactor plugin layout, add AI autocomplete and direnv, update docs

lua/plugins/lazydev.lua

@@ -0,0 +1,12 @@
+-- lazydev.nvim - Faster Lua/Neovim development
+-- Replaces neodev.nvim (which is archived)
+return {
+	"folke/lazydev.nvim",
+	ft = "lua",
+	opts = {
+		library = {
+			-- Load luv types when vim.uv is used
+			{ path = "${3rd}/luv/library", words = { "vim%.uv" } },
+		},
+	},
+}