[tor-bugs] #23830 [Metrics/Website]: Update README to get a development environment for metrics-lib going

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#23830: Update README to get a development environment for metrics-lib going
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     Reporter:  irl              |      Owner:  metrics-team
         Type:  task             |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Attempting to set up a development environment for metrics-web is not
 easy.

 There is a reference to Debian packages that don't appear to exist, for
 example I think r-cran-java should be r-cran-rjava maybe?

 It would be good to have a knowledgable person go over the whole thing and
 double check it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23830>
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