Clean up Search by Tag

[astrofoley]

Is your proposal related to a problem?

The current search by tag page is cumbersome since we now have so many tags. If you want to select a tag from the bottom of the list, you have to find it, grab it, and scroll up (while still grabbed) to put it in the other column. This is difficult UI and can cause confusion.

Describe the solution you'd like

A drop-down list like what we have on the detail page would work. But it might make sense to have check boxes. We might also want to think about other ways to organize tags generally since it could explode to hundreds.

Describe alternatives you've considered

Current solution works, but it isn't great.