add pubkey.* admin functions

contrib/templates/default/modpage.mustache

@@ -26,6 +26,18 @@
       </div>
     </div>
     <hr />
+    <div>
+      <div> key actions </div>
+      <div>
+        <label for="nntpchan_board_target">pubkey:</label>
+        <input type="text" id="nntpchan_key_target" />
+      </div>
+      <div>
+        <button onclick="nntpchan_key_add()">add key</button>
+        <button onclick="nntpchan_key_del()">remove key</button>
+      </div>
+    </div>
+    <hr />
     <div>
       <div> board actions </div>
       <div>