Add spinner to dialogs and auth buttons

- Remove help drop-down menu

Fix for https://github.com/Rise-Vision/common-header/issues/202,
https://github.com/Rise-Vision/common-header/issues/110,
https://github.com/Rise-Vision/common-header/issues/169

Remove Help drop-down menu and open help link in a new window

Fix for https://github.com/Rise-Vision/common-header/issues/169