docs: reduce png images (#9462)

Author: userquin

docs/.vitepress/config.ts

@@ -50,6 +50,7 @@ export default ({ mode }: { mode: string }) => {
     },
     head: [
       ['meta', { name: 'theme-color', content: '#22FF84' }],
+      ['link', { rel: 'icon', href: '/favicon.ico', sizes: '48x48' }],
       ['link', { rel: 'icon', href: '/logo-without-border.svg', type: 'image/svg+xml' }],
       ['meta', { name: 'author', content: `${teamMembers.map(c => c.name).join(', ')} and ${vitestName} contributors` }],
       ['meta', { name: 'keywords', content: 'vitest, vite, test, coverage, snapshot, react, vue, preact, svelte, solid, lit, marko, ruby, cypress, puppeteer, jsdom, happy-dom, test-runner, jest, typescript, esm, tinyspy, node' }],

docs/.vitepress/scripts/pwa.ts

@@ -52,7 +52,7 @@ export const pwa: PwaOptions = {
     screenshots: [{
       src: 'og.jpg',
       sizes: '2258x1185',
-      type: 'image/png',
+      type: 'image/jpeg',
       label: `Screenshot of ${vitestName}`,
     }],
     handle_links: 'preferred',