Production Image Update

[atoff]

When you have a production with an existing image (e.g. feature image) and you change it (e.g. by dragging over a new one, or from file browser), because of how filenames are encoded, the old image is not cache busted (i.e. it shows the old image)

[atoff]

Not sure how to handle this - if we encode a unique string into the filename, then we could result with lots of images that are not used in S3. However, if we just add a query string to the end of the URL, the browser will not cache/load from cache but this uses more data.

Presumably, this is a problem until the browser clears it's image cache, which should be when the browsing session's ends. This might be acceptable.