Print open home-gitops issues on the Epson receipt printer

Reads a Gitea API token from .gitea_token (gitignored, not present yet --
needs creating on the server), fetches open issues via the API, and prints
number/title/labels per issue with a running total. Button on the home page.

views/index.erb

@@ -9,3 +9,13 @@
     </ul>
   </div>
 </div>
+
+<div class="card mt-3">
+  <div class="card-body">
+    <h5 class="card-title">home-gitops open issues</h5>
+    <p class="card-text">Print a receipt-style summary of currently open issues.</p>
+    <form action="/issues/print" method="POST">
+      <button class="btn btn-secondary" type="submit">Print open issues</button>
+    </form>
+  </div>
+</div>