Requested feature overview description.

Support uploading WEBP format images. Currently the site has no clue what to do with them.

Why would it be useful?

Purplesmart.ai as well as some others generate webp images. The work of manually converting them to jpeg before upload is completely unnecessary and causes quality loss. Conversion to png is as unnecessary and bloats the filesize.

What part(s) of the site page(s) are affected?

uploads/new and /posts