Move guides from the base directory into the guides/ sub directory to
provide better organisation of the documents on the website.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

Information about the reference hardware and supported platforms is a bit
jumbled and out of date. Split out the listing of reference hardware by
architecture to avoid having one massive long page. Shift out development
related details.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

The virtual machine guidance is scattered over 3 pages, is poorly formatted
and a little out of date.

Check, update and merge the pages to make it more concise and relevant.
Move to it's proper location under `guides`.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

Martyn Welch authored 4 years ago and Emanuele Aina committed 4 years ago

The system startup document is out of date. Provide a brief updated
description of the Apertis boot process and move to a new "architecture"
section. Split out the boot analysis into its own document and move to a
new "guides" section. Remove the previously performed optimisations as
these describe patched in changes that no longer appear to be a part
of Apertis.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>