[docs] update catalogd component-internal web api docs, demos

[grokspawn]

Docs internal to the component repo (not published to the github pages site) also need updates to include the metas web api for discoverability, consistency. This includes the demos.

• - https://github.com/operator-framework/operator-controller/blob/main/hack/demo/catalogd-demo-script.sh
• -

  operator-controller/docs/draft/howto/fetching-catalog-contents.md

  Line 60 in 7f00b13

  The demo below