Add upvote for games in gallery

[recursiveforte]

In the gallery app view, we want to give the ability for people to upvote games. The upvote option should only be on gallery games that were not authored by the user. The upvotes do not need to initially be visible anywhere else in the web app - we just want to save the data off.

[grymmy]

I approve of this feature.

[MichaelK-F]

And when enough data is collected, the gallery could be sorted by most and least upvoted.