* Implement Azure AD oauth
* Use go-jose and cleanup
* Update go-jose in go.mod
* cleanup
* Add unit tests
* Fix scopes
* Add documentation page
* Improve documentation
* Convert extract_role into function.
* Do not use upn and replace unique_name with preferred_username
* Configure login button
* Use official microsoft icon and color from branding guideline.
* Add Azure AD config section in sample.ini.
