Add existing OpenID/OAuth service to replace blogifier login

[LinQiaoPorco]

Is your feature request related to a problem? Please describe.
I already have a OpenID/OAuth service deployed on basis of IdentityServer4 with several hundreds of users. So I want to leverage the blogifer as blog website without my users registering again. Is it likely to be considered to integrate add such functions?

Describe the solution you'd like
To have a configuration field in appsetings.json for user to choose if to use local login or external OpenID/OAuth/SAML authentication/authorization.
In the future, perhaps the comments system can also be integrated into this, managed as Comments API or something similar which also protected by OpenID/OAuth/SAML service.