Add oauth2 documentation (#6604)
* Add oauth2 documentation
Signed-off-by: Jonas Franz <info@jonasfranz.software>
* Apply suggestions from code review
Co-Authored-By: jonasfranz <info@jonasfranz.software>
* Update docs/content/doc/advanced/oauth2-provider.md
Co-Authored-By: jonasfranz <info@jonasfranz.software>
* Update oauth2-provider.md
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