Working redirect and other changes.
Remove github ribbon that didn't play nicely with responsive design.
Updated sysadmin guide.
Configuration utils documented and other minor changes
Changes to the layout. VOMS Admin 3.2.0 announcement post draft.
About us link commented in navbar
Done documentation-review:

- Fixed broken links
- Added 'service-ref-card'
- Fixed some typos
- Created 'About us' page
Merge branch 'gh-pages-next' of https://github.com/italiangrid/voms.git into gh-pages-next
'About us' page re-enabled
Add missing file
Removed Beta Release paragraph in Download section
Merge gh-pahes-next into gh-pages to get site back online