Push opam converter to Yunxing's npm-opam

[jordwalke]

We can make npm-opam support both forms until esy becomes the standard.

https://github.com/yunxing/opam-npm

We should also consider having better documentation for how people can convert their own packages.

[andreypopp]

Currently at https://github.com/esy-ocaml/esy-opam

There are a couple of changes:

• We publish packages to a custom registry (rather than to GitHub repos and npm proxy packages within the package scope, like @opam-alpha).
• We specify concrete versions of OPAM packages which we need to convert (rather than the number of latest releases).

[jordwalke]

We publish packages to a custom registry (rather than to GitHub repos and npm proxy packages within the package scope, like @opam-alpha).

Is there a reason why this is better than a git repo? I did not find a significant performance difference.

We specify concrete versions of OPAM packages which we need to convert (rather than the number of latest releases).

Great!

[andreypopp]

Closing this as we integrated opam packages installation into esy install command.