update todo, delete uneccessary body http respons

machine-client/index.html

@@ -76,6 +76,7 @@
   <button onclick="showForm('new-message')">POST /new/message</button>
   <button onclick="showForm('get-groups')">POST /get/groups</button>
   <button onclick="showForm('get-members')">POST /get/group/members</button>
+  <button onclick="showForm('del-group')" class="warn">POST /del/group</button>
   <button onclick="showForm('websocket')">WS /ws</button>
 </div>
 
@@ -176,6 +177,14 @@
       ],
       submit: () => httpPost('/get/group/members', { token:'gm-token', group:'gm-group' })
     },
+    'del-group': {
+      title: 'POST /del/group — delete group (owner only)',
+      fields: [
+        { id: 'dg-token',   label: 'token',   ph: '' },
+        { id: 'dg-groupid', label: 'groupid', ph: 'uint32' },
+      ],
+      submit: () => httpPost('/del/group', { token:'dg-token', groupid:'dg-groupid' })
+    },
     'websocket': {
       title: 'WS /ws — WebSocket connection',
       renderCustom: () => {