remove warning message fixes issue #13

Fixes #13
Closes #15
add link to documentation, fixes issue #11

Fixes #11
added more screenshots

Fixes #10
Closes #16
remove warning message fixes issue #13

Conflicts:
	bootstrap/css/cockpit.css
	index.html
start of download page
add os info boxes for each OS
instructions for all OSes
fix page name and docker instructions