fixing links after moving surfacing tutorials
fixing more links for the newly located tutorials
WIP: merging 3 getting started tutorials into one to cover all platforms, added new files
fixing broken images and links in 3-in-1 getting started, re-wrote story flow, linked to Toolbox, d4mac,d4win
Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
