Update studio landing page and add all-new install flow docs. bug: 27850063...

Update studio landing page and add all-new install flow docs. bug: 27850063 (update system reqs for 2.0) bug: 27725026 (update download page for 2.0) bug: 23908299 (clean up download and get started)
am: 9577d31b

* commit '9577d31b':
  Update studio landing page and add all-new install flow docs. bug: 27850063 (update system reqs for 2.0) bug: 27725026 (update download page for 2.0) bug: 23908299 (clean up download and get started)

Change-Id: I62118b609075b92c51ca6a2df26ecc22b6608c1f