homepage improvements

- show followed streams first
- show stream hashtags in video tile
- allow to visit hashtag page by clicking tag
- allow to follow/unfollow hashtags

src/pages/tag.tsx

@@ -0,0 +1,24 @@
+import "./tag.css";
+import { useParams } from "react-router-dom";
+
+import { VideoTile } from "element/video-tile";
+import { FollowTagButton } from "element/follow-button";
+import { useStreamsFeed } from "hooks/live-streams";
+
+export function TagPage() {
+  const { tag } = useParams();
+  const { live } = useStreamsFeed(tag);
+  return (
+    <div className="tag-page">
+      <div className="tag-page-header">
+        <h1>#{tag}</h1>
+        <FollowTagButton tag={tag} />
+      </div>
+      <div className="video-grid">
+        {live.map((e) => (
+          <VideoTile ev={e} key={e.id} />
+        ))}
+      </div>
+    </div>
+  );
+}