Revert "Remove email signup link in view"

This reverts commit dfa1015e45b7dc6e11ded0e64d8d011dbcd707a4.
MHRA signup points to prototype
Make checkboxes only scrollable on full width

In mobile these checkbox lists are full width and scrollable which means users get stuck in a little jabby scrolling well when they are trying to scroll the page. This commit makes the scrollable overflow and the set height only applicable to the two column layout provided for desktop