Add placeholder for password input

Signed-off-by: YoungSoo Shin <shinys000114@gmail.com>

main/service/ws.c

@@ -193,7 +193,6 @@ static void uart_event_task(void* arg)
                 // Muting this event because it is too noisy
                 break;
             default:
-                ESP_LOGI(TAG, "unhandled uart event type: %d", event.type);
                 break;
             }
         }

page/index.html

@@ -349,7 +349,7 @@
                 </div>
                 <div class="mb-3">
                     <label for="wifi-password-connect" class="form-label">Password</label>
-                    <input type="password" class="form-control" id="wifi-password-connect">
+                    <input type="password" class="form-control" id="wifi-password-connect" placeholder="Leave blank for open network">
                 </div>
             </div>
             <div class="modal-footer">