New 4.1. dashboard

Updated Dashboard page for Suite 4.1 Release.

Links to correct docs are not yet wired in because docs for 4.1 are not yet complete.  Still need to add:

- an updated Getting Started section  #359 
- a 'What's New in 4.1' page #358 
- links to demos of Boundless SDK templates  #360 
- Mike will also add a list of Suite extensions to the Docs that will be related. #357