feat: Enable tokyonight theme

It is just one of the best themes even when it
takes some ms more to load. You can disable tokyonight with
```lua
return {
  "folke/tokyonight.nvim",
  enabled = false,
}
```
in extras folder.

lua/vnext/config/init.lua

@@ -2,6 +2,3 @@ require("vnext.config.options")
 require("vnext.config.lazy")
 require("vnext.config.autocmds")
 require("vnext.config.mappings")
-
--- HACK: the default color scheme has a very bright color
-vim.api.nvim_set_hl(0, "StatusLine", { bg = "#1c1c1c" })

lua/vnext/plugins/ui.lua

@@ -81,16 +81,14 @@ return {
     },
     opts = {},
   },
-  -- {
-  --   "folke/tokyonight.nvim",
-  --   priority = 1000,
-  --   lazy = false,
-  --   opts = {
-  --     style = "moon",
-  --   },
-  --   config = function(_, opts)
-  --     require("tokyonight").setup({ opts })
-  --     vim.cmd("colorscheme tokyonight")
-  --   end,
-  -- },
+
+  {
+    "folke/tokyonight.nvim",
+    priority = 1000,
+    lazy = false,
+    config = function()
+      require("tokyonight").setup()
+      vim.cmd("colorscheme tokyonight-moon")
+    end,
+  },
 }

lua/vnext/plugins/which-key.lua

@@ -23,7 +23,6 @@ return {
     },
   },
   config = function(_, opts)
-    vim.api.nvim_set_hl(0, "WhichKeyTitle", { bg = "#000000" }) -- HACK: only works if border is black
     require("which-key").setup(opts)
   end,
 }