Display login with Google button on the login screen

[gordonkjlee]

Is your feature request related to a problem? Please describe.
Login with Google button not showing on the login screen

Describe the solution you'd like
Display login with Google button on the login screen

Describe alternatives you've considered
Login with username and password - but this defeats the purpose of "Enable OAuth authentication"

Additional context
NA

[eldy]

For technical reason, Google does not alow use of oauth inside a webview, this is why button is currently disabled.
We must found an alternative to do it...