feat(neovim): use built-in package manager.

lua/plugins/colorscheme.lua

@@ -1,12 +1,2 @@
-return {
-  {
-    "ellisonleao/gruvbox.nvim",
-    lazy = false,
-    priority = 1000,
-    config = function()
-      -- load colorscheme here
-      vim.o.background = "dark"
-      vim.cmd([[colorscheme gruvbox]])
-    end,
-  },
-}
+vim.o.background = "dark"
+vim.cmd([[colorscheme gruvbox]])

lua/plugins/init.lua

@@ -0,0 +1 @@
+require("plugins.colorscheme")

lua/plugins/lsp.lua

@@ -1,9 +1,3 @@
-return {
-  {
-    "neovim/nvim-lspconfig",
-    config = function()
-
-      vim.lsp.enable("nixd")
-    end,
-  },
-}
+vim.lsp.enable(
+  "nixd"
+)

lua/plugins/treesitter.lua

@@ -1,26 +1,19 @@
-return {
-  {
-    "nvim-treesitter/nvim-treesitter",
-    config = function()
-      require("nvim-treesitter.configs").setup({
-        ensure_installed = { "c", "lua", "vim", "vimdoc", "query", "go", "nix" },
+require("nvim-treesitter.configs").setup({
+  ensure_installed = { "c", "lua", "vim", "vimdoc", "query", "go", "nix" },
 
-        auto_install = true,
+  auto_install = true,
 
-        highlight = {
-          enable = true,
-        },
-
-        incremental_selection = {
-          enable = true,
-          keymaps = {
-            init_selection = "<Leader>ss",
-            node_incremental = "<Leader>si",
-            scope_incremental = "<Leader>sc",
-            node_decremental = "<Leader>sd",
-          },
-        },
-      })
-    end,
+  highlight = {
+    enable = true,
   },
-}
+
+  incremental_selection = {
+    enable = true,
+    keymaps = {
+      init_selection = "<Leader>ss",
+      node_incremental = "<Leader>si",
+      scope_incremental = "<Leader>sc",
+      node_decremental = "<Leader>sd",
+    },
+  },
+})