Fixes #2; Fixes broken link

CloudronManifest.json

@@ -21,7 +21,7 @@
     }
   },
   "manifestVersion": 1,
-  "website": "http://www.synthing.net",
+  "website": "https://syncthing.net",
   "contactEmail": "support@cloudron.io",
   "icon": "logo.png",
   "tags": [