Publish to JSR alongside NPM

[flevi29]

Why JSR

• https://jsr.io/docs/why
• primarily because it is the default registry for deno, but also it's striving to be (and already is a superset of) the replacement for npm with the goal of supporting every runtime equally
• secondarily, because it auto-generates documentation, easily switchable between versions, this way we wouldn't need typedoc and additional build step for it and configuration https://jsr.io/docs/writing-docs
  • we should also replace the lengthy README.md documentation with a link to the superior JSR page, but really we should already be doing this with the typedoc docs on github pages
• it also builds everything from TypeScript source files, so we wouldn't need any build step, at least not for JSR, in theory, still need to experiment with this