Revert "Merge pull request #480 from code-dot-org/gallery"

This reverts commit 48cd34ac1e354b29fc5a836b268cbf239d7fab73, reversing
changes made to ee21c59fb60130a107da9721f136a986bd5ffb46.
Merge pull request #481 from code-dot-org/revert_pr_480

Revert "Merge pull request #480 from code-dot-org/gallery"