Replace headline with Origin logo

Removed the existing headline, replaced it with the logo image
with alt text, and styled the image appropriately
Improve some link text.

A couple of the links were structured like:
"You can do X <a>here</a>"

This commit updates these to be more in the active voice, like so:
"<a>Do X.</a>"
Merge pull request #4 from EmilyDirsh/master

Replaced headline with new Origin logo