Docs should be updated to explain relation of all repos

[bexelbie]

We need the docs here to drive people to see the linkage with adb-utils and vagrant-service-manager - especially as bugs are often cross-cutting.

[hferentschik]

+1 Something which shows how all repos are connected.

[thatdocslady]

@hferentschik considering the current status of the project, is this still relevant? please review and close if not, or provide more info for docs if it is. Thx