takes out cardstack highlights

cardstack highlights are not a sold feature, so most branches should not
have them
Branding section added and inline positioning fixed

Branding bar added to the bottom of the context pane, which reads
"Powered by Context".

Also fixed a positioning problem where the context pane would appear to
the right of the nearest element even if they were inline ones (e.g. an
emphasis tag)
Finishes adding cardstacks

Adds the rest of the cardstacks that Vox publishes on their site. This
does not include the bulk of the cardstacks, however.
Revert "Finishes adding cardstacks"

This reverts commit 9c7bd8a77326a5702306aad8e67d8608cbb8f8de.
Adding back cardstacks

The previous commit took out the changes to the branding section
Adds more visual effects to hovercards

Adds fadeins and fadeouts, a loading timer, and an error message if
nothing can be found.
starting to add scrollbars. not stable

Code doesn't function right.
Revert "starting to add scrollbars. not stable"

This reverts commit 947b52ee9c19fc85f1cda274dc97718f243e280d.
Fixes highlight functionality, and minor tweaks

Highlights needed to be fixed after moving the hoverPane got overhauled.
Also tweaks branding a bit, and fixes a cardstack url