07: Add download link and title to downloads page.

* At this point, it seems pretty clear that I should have modeled my gif and video files. At least the gif files. That would have saved a few lines of code in the upload route.
07-b: Add style to download page. Center the result div.
07-b: Style the download link.
Merge branch '07-user-can-download' into development
Merge pull request #15 from JonathanTR/development

Development