Monorepo documentation updates

[OchiengEd]

Update documentation to reflect the newly effected monorepo changes.

[jsm84]

Linked to internal Jira story EET-4417.

[camilamacedo86]

We need to mainly:

• Ensure that it has no place in the docs linking the old repo
• We might need to update the Contribution and Readme accordingly as well. So we need to check it out. The links and information if required. (i.e

  operator-controller/CONTRIBUTING.md

  Line 21 in a67d023

  - [The Catalogd project](https://github.com/operator-framework/catalogd/), which hosts operator content and helps users discover installable content.

  )