replace FTP againts HTTPs and cleanup, closes #2

MensaPlugin.class.php

assets/mensa-widget.scss

classes/MensaCronjob.class.php

classes/MensaHelper.class.php

migrations/01_add_cronjob.php

migrations/02_add_config.php

migrations/03_add_config_location.php

migrations/04_refine_config.php

package.json

plugin.manifest