Adding intro for users & some product link updates
Updating Demo server info
Merge remote-tracking branch 'origin/develop'

Conflicts:
	omero/index.txt
Adding missing word to user/index
Add doc regarding FS server migration.
Add new page to index.
Implement hflynn's suggestions.
Clarify legacy data policy.
Add comma.
Make future plans more concrete.
Rephrase and bold text.
Adding ome 5 to product menu
Remove substitution from nested markup.
Merge pull request #385 from bpindelski/srvr-upgrd

Add doc regarding FS server migration (see #10964).
Merge pull request #387 from hflynn/prodmenu_dev

Adding ome 5 to product menu
Merge pull request #383 from hflynn/fs_users

Updating User index page & demo server for FS