Add gate groups. Graphics adjustments

src/static/admin.html

@@ -158,6 +158,7 @@
               <tr>
                 <th>ID</th>
                 <th>Name</th>
+                <th>Group</th>
                 <th>Type</th>
                 <th>AVConnect Macro ID</th>
                 <th>Status</th>
@@ -323,6 +324,11 @@
           <label for="gate-name">Name</label>
           <input id="gate-name" type="text" placeholder="e.g. Main entrance - Car" required />
         </div>
+        <div class="field">
+          <label for="gate-group-name">Group <span style="color:var(--text-muted);font-weight:400">(optional)</span></label>
+          <input id="gate-group-name" type="text" placeholder="e.g. Main entrance" list="gate-group-list" autocomplete="off" />
+          <datalist id="gate-group-list"></datalist>
+        </div>
         <div class="field">
           <label for="gate-type">Type</label>
           <select id="gate-type">