Minimizing thumbnail sizes

[erlend-sh]

Almost 2 MB of gif, can it be reduced?

Btw I noticed some entries that already have a 2mb gif. If size is a concern, maybe all entries should be static-image only going forward? With time that page is only going to become increasingly burdensome for low-bandwidth connections.

Allowing looped .mp4s is another option as those are a lot easier to optimize without significant quality loss.

Originally posted by @erlend-sh in #222 (comment)

Related: #188

[alice-i-cecile]

Also discussed in bevyengine/bevy-website#361 apparently. I think we should probably collect discussion over there?

[Nilirad]

We can still use this issue to track the progress of an Actions workflow that bans assets bigger than x kilobytes and certain unoptimized formats like gif.