Separate examples per concerns

[D4nte]

Problem

The current examples are fulfilling 2 concerns:

1. Show how to code a COMIT App (e.g. code comments in separate_apps)
2. Demonstrate and explained how an atomic swap is run (e.g. use of readLineSync to make the run interactive)

Several times we have evolved examples for 2. to the detriment of 1.

Moreover, with the new accountability structure, 1. Falls under product (devex) and 2. under community.

Goal

Remove any possible conflict/friction/obstacle for the various streams to be done.

Recommendation

1. Create a new demo folder beside the existing example folder
2. Duplicate the separate_apps (and improve naming) to the demo folder, strip the code from the comments.
3. In examples/separate_apps, remove the interactiveness
4. Decide if something similar needs to be done for btc_eth and erc20_btc.

Priority Justification

This is a pre-requisite to any future evolution of the examples (e.g. from workshop feedback).

In examples/separate_apps, remove the interactiveness

Should be done with the "get ready" documentation so this example becomes the target COMIT App that we build in the get ready doc.

[da-kami]

@D4nte isnt's this already done and merged?

[D4nte]

Done with #383