Reorganized sections; styled footer
Fixed missing CSS class for footer menus
Add correct links to repositories
Updated footer disclaimer
Content for community page with all links
Merge pull request #22 from staltz/develop

New footer
Added content to resources/tutorials page
Restyled headers and lists in pages: languages, community, tutorials
Removed obsolete and empty pages
Hid all dead/temporary links
Changed index content: very minimal presentation of ReactiveX
Merge pull request #23 from staltz/develop

Bare minimum preparations for production
Merge pull request #24 from ReactiveX/develop

merging PR #22 and #23 to master