Add section for GitOps example patterns

[RedbackThomson]

We would like to have a section of the website dedicated to re-usable GitOps patterns. That is, somewhere prospective GitOps users will go for tutorials, code snippets or any other resources they could follow to employ best practices into their own clusters.

These resources could be grouped by common use cases, possibly aggregated by deployment strategy (cloud or self-hosted). It would be great if blog posts could also provide context about these patterns, or information about securing, maintaining and scaling them.