Add another image proxy to give users alternatives

[galpt]

Describe your suggested feature

Kind of similar to https://github.com/KotatsuApp/Kotatsu/issues/357. Some manga websites load images really slow. Image proxies will help boosting image load times from the user's perspective.

Adding wsrv.nl was a good idea, but I think it's better to add more proxies and give users the ability to choose what proxy works better for them.

I would recommend adding this proxy too to help speed up loading the images. This does not reduce image quality, but it caches the images nearest to the users, so it will still help speeding up image load times.

From the user's perspective, useful for users who aren't worried about bandwidth but keep getting slow load times. From the manga website's perspective, caching proxy will help reducing the server's burden for manga titles that are frequently visited/downloaded.

tl;dr — as the title suggests, this gives another alternative for users to use & maybe compare too.

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.