Release notes & stuff for voms-admin-server 3.3.1
Restructuring

- Leverage _data dir for version information
- Create latest releases page from version information
- Links to older release notes
- Links to older documentation versions
- White navbar looks prettier than the dark one
Fixed baseurl reference
Simpler release and documentation presentation

Use a single column for releases and doc versions
Toggle button for older releases/doc versions
Change text in toggle button
Merge pull request #22 from andreaceccanti/gh-pages

Site for VOMS Admin 3.3.1 + VOMS 2.0.12-2 release