Add direclink get image, new Instance and better url

[py7hon]

Thanks for making this project.

I want to give contribution host the instance and add feature like get direct image ex localhost:2034/123.png and i making url better without /en/.

[py7hon]

Updated support multi illust image
example :
localhost/114027629-1.jpg
localhost/114027629-2.jpg

[PrivacyDevel]

Thank you for your contribution!

1. The /en/ part should become optional eventually. But completely removing it and breaking links seems like a bad idea.
2. Json endpoints would be nice as an opt-in feature that can be turned on in the config file but inviting bots with publicly accessible Json endpoints by default seems a bit risky.
3. Simple image proxying via Python would make it less dependent on an additional reverse proxy but the way it is implemented here is likely going to prevent both client- and server-side caching from working.

Because of all of this, I am probably not going to merge this PR, at least not the way it is right now.
If you decide to work on one or more of those things, it would be great if you could split those changes into separate PRs in the future.

But I am gladly going to add your instance to the instance list :)