[Container-tools] Consolidate Docs for ADB (and related projects) into a single repo

[Brian (bex) Exelbierd]

Hola,

We'd like to consolidate the documentation related to the ADB into a new 
repository in ProjectAtomic GH namespace.  The working name for the repo 
is "Developer-Docs".

The affected projects would be: ADB, Vagrant-Service-Manager and ADB-utils.

The goal of this move is to:
o Make it easier to tell a cohesive story and improve onboarding.
o Enable deeper cross-linking
o Enable easier community contribution (including downstream consumers) 
by centralizing docs to reduce "hunting"
o Enable easier publishing to docs.projectatomic.io (very 
WIP/conceptual) - it will at least not make it harder

Docs that are for developers working on the tools themselves will not be 
moved at this time.  This can be done if there is a general feeling this 
is valuable.

Each sub-project repo's README would be updated to direct users to the 
docs in the published location (initially in the new repo).

Given the impact of these changes, I'd like to see acks from an 
appropriate set of maintainers from each project.  If a project would 
like an issue to ack against in their project, please reply and I will 
create one.

Assuming it is accepted, the conversion to AsciiDoc will be done in 
conjunction with this move.  We may also reorder/rewrite docs as a part 
of this to begin telling a more cohesive and complete story.

Thank you.

regards,

bex