feat(neovim): add some plugins!

programs/neovim/default.nix

@@ -1,10 +1,19 @@
 {pkgs, ...}: {
-  environment.systemPackages = with pkgs; [
-    (lua5_1.withPackages (ps: with ps; [luarocks]))
-  ];
-
   hm.programs.neovim = {
     enable = true;
     extraLuaConfig = builtins.readFile ./init.lua;
+
+    extraPackages = with pkgs; [
+      (lua5_1.withPackages (ps: with ps; [luarocks]))
+      tree-sitter
+    ];
+
+    plugins = with pkgs.vimPlugins; [
+      barbar-nvim
+      catppuccin-nvim
+      lualine-nvim
+      nvim-treesitter.withAllGrammars
+      nvim-web-devicons # for lualine
+    ];
   };
 }