Add buttons to /ota

Network.h

@@ -64,7 +64,6 @@ public:
 
     int mqttConnectionState(); // 0 = not connected; 1 = connected; 2 = connected and mqtt processed
     const char* latestHubVersion();
-    const char* latestHubVersionUrl();
     bool encryptionSupported();
     const String networkDeviceName() const;
 
@@ -115,7 +114,6 @@ private:
     String _lockPath;
 
     const char* _latestVersion;
-    const char* _latestVersionUrl;
     HTTPClient https;
 
     Preferences* _preferences;