docs: wording changes for offline support

quartz/components/Explorer.tsx

@@ -22,6 +22,7 @@ const defaultOptions = {
       return -1
     }
   },
+  filterFn: (node) => node.name !== "tags",
   order: ["filter", "map", "sort"],
 } satisfies Options
 

quartz/components/pages/OfflineFallbackPage.tsx

@@ -4,7 +4,7 @@ function OfflineFallbackPage() {
   return (
     <article class="popover-hint">
       <h1>Offline</h1>
-      <p>This page isn't offline available yet.</p>
+      <p>You're offline and this page hasn't been cached yet.</p>
     </article>
   )
 }