Add link for Keycloak credentials in wiki sidebar.
* [[File credentials|Configuration-Credentials#credentials-type-file]]
* [[GitHub credentials|Configuration-Credentials#credentials-type-github]]
* [[Environment credentials|Configuration-Credentials#credentials-type-env]]
+ * [[Keycloak credentials|Configuration-Credentials#credentials-type-keycloak]]
* [[Repository|Configuration-Repository]]
* [[Single repository on port|Configuration-Repository#single-repository-on-port]]
* [[Repositories types|Configuration-Repository#supported-repository-types]]
