Improve OIDC configuration documentation
We have experimental support for connecting the Web console to an OIDC provider, there are basic steps to to configure the helm values on the docs: https://stackgres.io/doc/latest/api/rbac/#openid-connect-provider-mechanism
This doc page is far from having a complete setup for OIDC, so we need a Tutorial page-like configuring OIDC that users can follow.
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Create a tutorial page documentation to set up OIDC authentication using Keycloak and StackGres.