chore: add down for maintenance banner

Author: coolaj86

index.html

@@ -67,6 +67,17 @@ <h1>Bliss: Blog, Easy As Gist</h1>
           </li>
         </ul>
       </nav>
+      <p>
+        <mark><strong>Maintenance: 2024-05-05</strong></mark>
+        <br />
+        Bliss will be <mark><strong>down for maintenance</strong></mark> for a
+        few hours while updating the database and moving to a new server.
+        <br />
+        <mark>Sync will not be available during this time</mark>, but documents
+        <strong>will save locally</strong>, and
+        <strong>sync will resume</strong> afterwards.
+      </p>
+      <br />
       <p>
         Want a Blog in <strong>30 seconds</strong>? Try out our GitHub
         <mark>Template + Actions</mark>: