WebSockets: add surface version numbers to index page

share/web_surfaces/index/main.css

@@ -80,6 +80,11 @@ h2 {
 	margin: 4ex 0;
 }
 
+.surface-version {
+	color: #337ab7;
+	font-size: 0.75em;
+}
+
 .disk-path {
 	font-family: Monaco, monospace;
 	font-size: 0.66em;

share/web_surfaces/index/main.js

@@ -44,6 +44,8 @@ import { Ardour } from '/shared/ardour.js';
                     const li = document.createElement('li');
                     li.innerHTML = `<li>
                         <a href="${group.path}/${surface.path}/">${surface.name}</a>
+                        &thinsp;
+                        <span class="surface-version">(${surface.version})</span>
                         <p>${surface.description}</p>
                     </li>`;
                     ul.appendChild(li);