Instead of tutorials. The goal is to refine Try Holos Locally down to a
minimal number of steps and then branch out to deeper use cases like
ArgoCD, Backstage, etc...
This patch moves the ArgoCD related sections to a separate "dive deeper"
guide to trim down the length of the try holos guide.
Previously there are no diagrams in the documentation. This patch wires
up mermaid for use in code blocks in the markdown files. A minimal
diagram is added to verify mermaid works but it's not the final diagram.
