theme：主题更换。

lua/plugins/theme.lua

@@ -0,0 +1,13 @@
+return {
+    "projekt0n/github-nvim-theme",
+    name = "github-theme",
+    lazy = false, -- make sure we load this during startup if it is your main colorscheme
+    priority = 1000, -- make sure to load this before all the other start plugins
+    config = function()
+        require("github-theme").setup({
+            -- ...
+        })
+
+        vim.cmd("colorscheme github_dark_dimmed")
+    end,
+}