Adding server side files

[stappersg]

• server_side/service Systemd unit for auto starting rgit under dedicated user

• server_side/rgit_pre_flight_check Pre flight check, includes check on the rgit service being install

• server_side/rgitsss Helper script for dealing with rgit related tasks as -- creating an user account for rgit service -- making directory for that user -- git clone into rgit directory -- git into into rgit directory -- publish and unpublish git repositories -- place descriptions on git repos -- handling SSH-keys

• server_side/config Input for further discussion

• server_side/default Temporary configuration file

• server_side/README Documents the server side files

Also modified Cargo.toml. To effect the output/outcome of cargo deb.