added heading and description of Swarm mode below table, tweaked headings
added Swarms screen snap
added a standard mode indicator to infrastructure overview title
re-organized order of topics in table and below
re-wording to swarm topic, added x-refs from d4mac, d4win to cloud topics
Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
Victoria Bialas