[tor-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):

 Replying to [comment:13 karsten]:
 > Note that I had to install `libtaglibs-standard-impl-java` as well.

 (Looks like it's a dependency of `libjetty9-extra-java` which I didn't
 install explicitly. Might be okay to leave it out, though it wouldn't hurt
 to list it as well.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23830#comment:14>
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