update installer slides
css fix for install, steps to top
simplify installation steps
fix step indexes
more indexes fixed and remove deprecated DR stuff
css corrections
longer interval on installing slides
change opacity for "in use" configure widget
confirmation packages template correction
fix installation step consecution and final step with correct menu
some fixes in the last commit
added changelog entry
slide texts reviewed
Merge pull request #1559 from Zentyal/jacalvo/new-slides

Jacalvo/new slides