Update docs and start publishing sourcify-server following the Reusable Server Module

[kuzdogan]

The docs need to be updated for #1637

Besides, should we start publishing the server on npm? cc: @RaoulSchaffranek

[RaoulSchaffranek]

Yes, I'm in full support of publishing the server to npm. It makes it easier for downstream tools like our debugger to manage the dependency on Sourcify and stay up-to-date. Another advantage is that npm packages don't need to be rebuilt every time they're installed - which means less messing with manual build steps.