Docker Scout is in early access, but some parts of the documentation
(reference docs) did not contain a banner for this.
This patch:
- Changes the "note" to "early access" (just a minor improvment)
- Adds banners to all the CLI reference pages
- Adds (Early Access) in the CLI reference navigation (TOC)
- Moves the banner to an include
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>