Game images

[jazzsequence]

Since 1.2.0, GC supports post thumbnails (which we get from Board Game Geek), but currently we have nothing to do with them on the front end. Need to scope out what support for game images looks like, but should include:

• [ ] 1. Import image from BGG for existing titles (nice to have)
• [ ] 2. Render game images on the front end
• ~3. Possibly provide a show/hide option for images~

Notes to the above

1. There should be some way to manually sideload images for a game. Not sure what this would look like, but it needs to be there and this feature is a no-go until importing from BGG is supported.
2. This may require additional styling and/or tweaking with Isotope.
3. ~I really don't want to add an options page. If we can avoid this without making the games list look like crap, that would be ideal.~

[jazzsequence]

Updated requirements. I don't want to drag this feature out longer than it needs to be. Sideloading images from BGG for existing titles would be nice but isn't required. It seems like when this was originally written, images weren't already being imported from BGG (or maybe I forgot that they were). We're getting the images from BGG when we add a game from BGG and we need to support games without images for those games that don't exist on BGG anyway, so the first item is not a requirement or a blocker to the feature and could become its own feature/issue as follow-on work.

The main thing that we need is to render the images that we are already getting from BGG on the front-end.