pruning Compose file v2 reference
updated Compose v1, v2, v3 files, still WIP
added includes for compatibility matrix, fixed TOC menu
new topic organziation Compose reference, split two 3 files plus versioning
Daniel's comments, fixed links, added more to versioning details
fixed volumes_from example per Daniel's comments for v1
simplified links to version references
copyedits and improved/surfaced links to versioning/upgrade docs
removed for version specific content re: volume_drivers from various files
Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
Victoria Bialas