Ensure ziti-doc is up to date for HA

[plorenz]

Move/copy some of the ha doc from ziti to ziti-doc

• Make sure everything is up-to-date
• Need migration guide
• Need overview
• Best practices?

Make sure controller/router config doc is updated

Completed

• Events Configuration

[qrkourier]

• https://openziti.io/docs/reference/configuration/router (docusaurus/docs/reference/30-configuration/router.md) is missing the top-level ha section.
• https://openziti.io/docs/reference/configuration/controller#web (docusaurus/docs/reference/30-configuration/controller.md) is missing the edge-oidc binding