investigate and fully document the https workflows

see:
- https://github.com/joeferner/node-http-mitm-proxy/issues/74
- https://github.com/joeferner/node-http-mitm-proxy/issues/50
- https://github.com/joeferner/node-http-mitm-proxy/issues/106
- https://github.com/joeferner/node-http-mitm-proxy/issues/40
- https://github.com/joeferner/node-http-mitm-proxy/issues/64
- https://github.com/joeferner/node-http-mitm-proxy/issues/39