docs: Documentation revision

[jhmarina]

What needs to be done

Do a full revision of our documentation, find out which information is missing, and which is out of date and correct it if needed.

Why it needs to be done

The Rancher Communities folks, who can help us promote the project through different actions, require the project to have well-defined documentation. We will review our documentation on a regular basis.

Acceptance Criteria

Additional Information

[jhmarina]

Reopening this as it is still work in progress