use cache busting for video thumbnails

src/pages/index.astro

@@ -6,7 +6,6 @@ import Craftattack from '@assets/img/craftattack.webp';
 import Background from '@assets/img/background.webp';
 import { HOMEPAGE_TRAILER_URL, START_DATE } from 'astro:env/server';
 import { getSetting, SettingKey } from '@util/settings';
-import { siteUrl } from '@util/url.ts';
 import { db } from '@db/database.ts';
 
 const signupEnabled = await getSetting(db, SettingKey.SignupEnabled, false);