DOC-1778: Removed github from OIDC authN list (#1427)

Author: Feediver1

modules/console/pages/config/security/authentication.adoc

@@ -265,9 +265,6 @@ You can use any OIDC-compliant IdP with Redpanda Console. Here are common provid
 
 | Keycloak
 | `\https://<keycloak-host>/realms/<realm>`
-
-| GitHub (Enterprise)
-| `\https://github.com/login/oauth`
 |===
 
 Some IdPs, such as Google, issue opaque access tokens that are not JWTs. While these tokens work for logging in to Redpanda Console (the ID token is a JWT), they cannot be used for impersonation with the Kafka API. In such cases, impersonation must be disabled, and Redpanda Console must be configured to use static service account credentials instead.