Enable scrolling

Currently, list of projects overwhelms the window height on low-resolution Chromebooks. This change to the CSS should fix that...
Update style.css
Make overflow-y 'auto' as per the approver's request...

Apparently 'overflow-y: scroll' would put a permanent scroll bar there, which would make it look ugly. Glad this is fixed now...
Merge pull request #28 from KennyStrawn177/patch-4

Enable scrolling in project list