More updates

- Add Back to top link in footer component.
- Remove unused slider css for now.

src/components/footer.svelte

@@ -1,3 +1,4 @@
 <footer class="container py-3">
     <p>&copy; 2020-2021 Quartznet | <a href="./policy">Policy</a></p>
+    <p><a href="#">Back to top</a></p>
 </footer>

src/routes/blog/index.svelte

@@ -27,8 +27,7 @@
 
 <main class="container">
     <section>
-        <h1>Recent posts</h1>
-
+        <h2>Posts</h2>
         <ul>
             {#each posts as post}
                 <!-- we're using the non-standard `rel=prefetch` attribute to