Create clickable links on feature details pages

Create clickable links on feature details pages

There are many feature matrix details pages that would have
just a plain URL that was not clickable, either due to someone
accessing a feature matrix details page directly, or due to an
old details pages with a description being converted to just a
link.

This ensures that such pages can have a clickable link to attempt
to create a better user experience. Doing so from the Django
template filters is a bit roundabout, but it does get the desired
effect.