Update login templates to PatternFly 4 design

[rhamilto]

Important: I need help testing these changes as I am unclear on how to go about doing so.

The templates should render as seen at:

• https://rhamilto.github.io/oauth-templates/okd/errors.html
• https://rhamilto.github.io/oauth-templates/okd/login.html
• https://rhamilto.github.io/oauth-templates/okd/providers.html

cc: @spadgett, @benjaminapetersen

[benjaminapetersen]

Screenshots maybe? This is tricky to review :)

[benjaminapetersen]

@stlaz fyi

[benjaminapetersen]

@rhamilto this should prob do the job:
https://gist.github.com/benjaminapetersen/3259fd041d47925f66a064a59311d443
It involves setting the authentication.operator to Unmanaged and then overriding the oauth-server image.

[benjaminapetersen]

Cross reference for good measure:

• Update login templates to PatternFly 4 design cluster-authentication-operator#244
• https://github.com/rhamilto/oauth-templates (to move to openshift org?)

[stlaz]

/assign @stlaz

[rhamilto]

/retest

[stlaz]

/lgtm
appears to be working as expected

[openshift-ci-robot]

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