rsc start: Report on the RStudio and R version to be used

[HenrikBengtsson]

Somewhat related to #75:

It could be useful for troubleshooting if rsc start reported on the RStudio Server and R versions used, e.g.

alice, your personal RStudio Server 2022.02.4-500 running R 4.2.2 is now available on:

   <http://127.0.0.1:3987>

Importantly, if you are running from a remote machine without direct access to dev2.example.org, you need
to set up SSH port forwarding first, which you can do by running:

  ssh -L 3987:dev2.example.org:3987 alice@log1.example.org

in a second terminal from your local computer.

Any R session started times out after being idle for 120 minutes.
WARNING: You now have 10 minutes, until 2023-03-29 10:13:51-07:00, to connect and log in to the RStudio Server
before everything times out.
Your password for this RStudio Server instance is: N0Amem0jS6A0xj343i8

[HenrikBengtsson]

Implemented