Make client part reusable

[rexim]

Derived from #26

The client part is located in the public/js folder and depends on jquery and jquery-console. We can probably wrap that into an installable npm package with the corresponding dependencies.

This issue is one of the steps to feature let-morganey-rest on https://morganey-lang.github.io/

[rexim]

@keddelzz please approve when you get a chance.

[keddelzz]

I approve this enhancement!