docs(style): use Tailwind to customize the docs colors

docs/tailwind.config.mjs

@@ -0,0 +1,17 @@
+import starlightPlugin from '@astrojs/starlight-tailwind';
+import colors from 'tailwindcss/colors';
+
+/** @type {import('tailwindcss').Config} */
+// eslint-disable-next-line import/no-anonymous-default-export
+export default {
+  content: ['./src/**/*.{astro,html,js,jsx,md,mdx,svelte,ts,tsx,vue}'],
+  theme: {
+    extend: {
+      colors: {
+        accent: colors.orange,
+        gray: colors.slate,
+      },
+    },
+  },
+  plugins: [starlightPlugin()],
+};