Documentation improvements
Description
Changes proposed in this merge request:
- Show an additional level on ToC
- Add a link to the website on the main page.
- Remove install instructions as they are now on the website.
- Remove Resources section as that information can be found at the website, and also looks bad.
- Move artifact server setup from the no longer existing Install section to the Using section.
This merge request, when approved, will close issue/bug: