Enhance docs to explain deployment scenarios

[dimityrmirchev]

What would you like to be added:
We maintain a helm chart that should be used in order to deploy OWA productively, however we do not have this documented. A getting started document on how to deploy OWA in a cluster will be helpful for new adopters and users.

[jianhang33]

Thanks for creating the issue.

A topic worth mentioning in this issue is that kubernetes apiserver will not be able to discover the service by name, based on kubernetes-sigs/kind#1077 (comment) (It is not an issuer for other services.) If you already have a solution, it would great to mention it in the doc. If no solution, the kubernetes service needs to include ClusterIP, so that apiserver can talk to the service directly using the ID.

[jianhang33]

It would be nice to mention that jwks.keys could be used to configure providers in Registration of Providers. I had to make extra effort and go through the code to discover this.