Revert "feat: Making Quartz available offline by making it a PWA (#465)"

This reverts commit d6301fae90.

quartz/components/pages/OfflineFallbackPage.tsx

@@ -1,12 +0,0 @@
-import { QuartzComponentConstructor } from "../types"
-
-function OfflineFallbackPage() {
-  return (
-    <article class="popover-hint">
-      <h1>Offline</h1>
-      <p>This page isn't offline available yet.</p>
-    </article>
-  )
-}
-
-export default (() => OfflineFallbackPage) satisfies QuartzComponentConstructor