Refresh Kubernetes Guides and Documentation

[lichtie]

The documentation we have for Kubernetes is a bit scattered and some is outdated. It'd be nice to do a full refresh so that the information is well-organized, up-to-date, and helpful for different levels of experience.

[lichtie]

https://www.pulumi.com/docs/iac/guides/continuous-delivery/pulumi-kubernetes-operator/

This guide is quite long. This and Github App should be separated to indicate the increased level of support. They're features we offer, not just integration guides

[lichtie]

Refresh these: https://www.pulumi.com/docs/iac/clouds/kubernetes/#guides