Fix bugs around recent jars

- Fixes a bug where you couldn't click the description text to follow
the link
- Fixes a bug where sometimes there would be a scroll bar on the bottom
of the page (thanks @sigmavirus24)
- Moves the .recent-jar* styles closer together
General cleanup

- use hiccup form helpers when possible
- specify how many grid columns for all screen sizes
- use when instead of if when there is only one condition