[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 irl):

 `libpostgresql-jdbc-java` is missing from this list.

 Only `r-cran-rjava` doesn't contains Rserve.jar, but `r-cran-rserve` has
 both.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23830#comment:9>
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