build(docs): add type declarations for virtual:starlight

docs/src/components/Header.astro

 ---
 import config from 'virtual:starlight/user-config';
-import type { Props } from '../props';
+import type { Props } from '@astrojs/starlight/props';
 
 import LanguageSelect from 'virtual:starlight/components/LanguageSelect';
 import Search from 'virtual:starlight/components/Search';

docs/src/components/MobileMenuFooter.astro

@@ -2,7 +2,7 @@
 import LanguageSelect from 'virtual:starlight/components/LanguageSelect';
 import SocialIcons from 'virtual:starlight/components/SocialIcons';
 import ThemeSelect from 'virtual:starlight/components/ThemeSelect';
-import type { Props } from '../props';
+import type { Props } from '@astrojs/starlight/props';
 import VersionSelect from './DocsVersionSelect.astro';
 ---
 

docs/src/env.d.ts

-// eslint-disable-next-line @typescript-eslint/triple-slash-reference
+/* eslint-disable @typescript-eslint/triple-slash-reference */
 /// <reference path="../.astro/types.d.ts" />
 /// <reference types="astro/client" />
+/// <reference path="../node_modules/@astrojs/starlight/virtual.d.ts"/>