20200109.2

Fix "discovery" page loading too-large thumbnails, or loading thumbnails multiple times.

This was caused by very strange code that loaded the thumbnail first in an <img> tag with height="0" width="0", then re-loaded the thumbnail as a <div> background image with size set appropriately. I have worked around the issue by overriding the size on the initial <img> tag with the actual size of discovery page thumbnails (hardcoded).