Modifications to /open-data page
Modifications to /open-data page

* add front-matter
* use two-up layout
* use panels for licence freedoms/restrictions
* add panel for next anticipated release and previous releases
* move subscription notice up

librariesio/libraries.io,librariesio/libraries.io,librariesio/libraries.io,abrophy/libraries.io,abrophy/libraries.io,abrophy/libraries.io,librariesio/libraries.io