Include API methods/calls in the generated documentation

Follow-up from: https://github.com/zitadel/zitadel/issues/5825

As a developer/user, I want to be able to search for REST/GRPC calls in our docs so that I can find and read the documentation for the corresponding call.

Why is it not working today?

• API docs are generated automatically, we use the https://github.com/PaloAltoNetworks/docusaurus-openapi-docs
• The final markdown is generated directly from the plugin
• There was no obvious way for me to crawl the rest call (method + resource path) as well as the RPCs in a consistent way from the docs page

### Acceptance Criteria
- [ ] Decision: Manually include calls in description vs. Generate automatically?
- [ ] REST method and resource path is available in the docs page (either as part of the content or tagged with a unique css class)
- [ ] RPCs are available in the docs page (either as part of the content or tagged with a unique css class)