nvim: Add todo comment highlighting plugin

Added todo-comments.nvim plugin by folke, which will automatically
highlight (in a sane color) all the `TODO:`, `FIXME:`, `WARN:`, and more
comments within code.

nvim/.config/nvim/lazy-lock.json

@@ -82,6 +82,7 @@
   "telescope-luasnip.nvim": { "branch": "master", "commit": "11668478677de360dea45cf2b090d34f21b8ae07" },
   "telescope.nvim": { "branch": "master", "commit": "a0bbec21143c7bc5f8bb02e0005fa0b982edc026" },
   "texpresso.vim": { "branch": "main", "commit": "1cc949fde8ed3220968039b6b1b6ccdd9f475087" },
+  "todo-comments.nvim": { "branch": "main", "commit": "313b04e5b02d29ab9275c9295ff5e2b73921b0eb" },
   "trouble.nvim": { "branch": "main", "commit": "40c5317a6e90fe3393f07b0fee580d9e93a216b4" },
   "twilight.nvim": { "branch": "main", "commit": "8bb7fa7b918baab1ca81b977102ddb54afa63512" },
   "undotree": { "branch": "main", "commit": "eab459ab87dd249617b5f7187bb69e614a083047" },

nvim/.config/nvim/lua/plugins/ui.lua

@@ -149,6 +149,12 @@ return {
 			},
 		},
 	},
+	{
+		"folke/todo-comments.nvim",
+		dependencies = { "nvim-lua/plenary.nvim" },
+		opts = {},
+		event = "VeryLazy",
+	},
 	{
 		"jiaoshijie/undotree",
 		dependencies = {