Change links to images in Quick Start guide

 * the old links point to Savanna 0.3 images
 * + fixed a small typo

Change-Id: Icce1358fcbaad5b73e82f78d9c86d5285afba13b
(cherry picked from commit 2cccc06b7506d9289bf9164171ba5bf68addee14)
Updated hdp_plugin features to align with current capabilties

* Minor re-write of Swift integration feature
* Extracted plugin capabilities into an easy to update/view table

Co-Authored-By: Alexander Ignatov <aignatov@mirantis.com>

Partially Implements: blueprint  update-docs-icehouse

Change-Id: I4014e9549467b4ad3d3fe888aad98e1079796013
(cherry picked from commit 158e897e1f185d9b17aec31fcfeff5b7c7d190cd)