Fix #200 (!267)

* remove /ws from listen address

* fix error when user already exist

* change binary to duniter2

* add rpc-cors

* add config documentation

* add reference in service files

* use embedded distance oracle

* optimize ci

* use docker cache

* add systemd timer

* add documentation

* fix base_path default

* add duniter user

* add services

* update docs

* add deb package to ci

* add deb docker building