add ScrollWarning, improve HomeMenu and meta tags

src/lib/Feed.svelte

@@ -2,6 +2,7 @@
     import { RiChatOffLine } from "svelte-remixicon";
     import Centered from "./Centered.svelte";
     import FeedPost from "./FeedPost.svelte";
+    import ScrollWarning from "./ScrollWarning.svelte";
 
     let { posts, emptymsg = "No posts, how empty" } = $props();
 </script>
@@ -14,6 +15,10 @@
         <p class="big"><RiChatOffLine /></p>
         {emptymsg}</Centered>
     {/each}
+    {#if posts}
+    <!-- TODO make feeds keep track of a "next page" -->
+    <ScrollWarning next={2} loadNext={() => {}} />
+    {/if}
 </ul>
 
 <style>