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

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#23830: Update README to get a development environment for metrics-web going
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 Reporter:  irl              |          Owner:  metrics-team
     Type:  enhancement      |         Status:  new
 Priority:  Medium           |      Milestone:
Component:  Metrics/Website  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by karsten):

 Alright, I made a start in updating the README
 [https://gitweb.torproject.org/karsten/metrics-web.git/log/?h=task-23830
 in my task-23830 branch]. However, I can't determine whether we ever
 needed that `r-cran-[r]java` package, and I ran into issues with JSTL
 packages being missing in Stretch that were still present in Jessie.

 iwakeh, did you succeed in setting up a metrics-web instance? If so, can
 you resolve that JSTL mystery? If not, can you try setting up an instance
 and, erm, resolve that JSTL mystery? ;) If not, I'll give it another try
 another time.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23830#comment:3>
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