The upstream security engineering team have made considerable restructuring changes and added more content to the following OIDC diataxis concept that we have already imported and edited in prep for downstream: 

https://github.com/quarkusio/quarkus/pull/33794/files#

This task tracks the work to apply Quarkus style to the PR and to consolidate the conflicts as a result of multiple contributors working on the same content at the same time.

OPENID CONNECT AUTHORIZATION CODE FLOW MECHANISM FOR PROTECTING WEB APPLICATIONS

security-oidc-code-flow-authentication-concept.adoc

https://quarkus.io/guides/security-oidc-code-flow-authentication-concept