feature request: oidc.enabled in config.yaml

[jessebot]

Description

Thanks for maintaining headplane! Finding a webui for something that uses wireguard that is oidc compatible is pretty difficult so I was really happy to find this project!

I would like if we could always pass in an oidc section of the config. This makes it easier to template for things like a helm chart where we provide all the same parameters, as they would be required, and then just check if oidc is enabled by checking if oidc.enabled is set to true in the config file (or in kubernetes, this would be the values.yaml). This also makes it easier to auto-generate docs from a values.yaml, because some doc generators only create docs for uncommented values.