Missing information in scope statement

[FewerFlaws]

I had to dig into source code to figure out which image formats are supported. It would be nice if this information was presented in the feature list.

At a glance it looks like client-side caching is used. This is another item to present on the feature list.

A statement about access control would also be nice. At the moment it looks like there is none.

[Webreaper]

Yes, I need to add supported image formats to the readme and website - thanks. More importantly, I need to list key formats which aren't supported (e.g., HEIC, as mentioned in #17).

Client-side caching isn't used explicitly, but yes, thumbs etc will be cached client-side by the browser.

And whilst access control and user identity isn't explicitly mentioned in the docs, it is mentioned in #8. But I'll add a note in the Readme.