Drop webpack build in favor of tsc

[AuHau]

Webpack is not necessary for building nodejs only sources. Typescript itself ships with tsc compiler that could be used.

[nugaon]

It seems to me rather a drawback, than a feature that we need.
Webpack is a common tool among Swarm JS projects, which fits completely with our needs.
It provides many customizable properties that we can utilize to examine/alter/mutate/enchant our code.
Webpack uses babel now like Jest too.
If we build browser code with webpack and we don't do with that for node, then it is an asymmetric workflow.
I think we had better to keep the current webpack environment for compiling both node and browser boundles.
Regardless of these, I support to review the webpack configuration since it surely has unnecessary settings.