[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 iwakeh):

 Replying to [comment:10 irl]:
 > I found that I also required `tomcat8-annotations-api-8.5.24.jar` but
 this may be due to me using different versions on Debian testing. Next
 year I'll get a Debian stable virtual machine set up for doing
 development/testing on.

 Thanks for running it!
 Hopefully, we get out a release before that.  Our releases always include
 a full set of dependencies.  The end of jar hunting.

 >
 > I also had to disable `duplicate="fail"` for the war target in the ant
 script. This is probably suboptimal although I don't really understand
 what that does. Maybe it's only working for me by chance.

 That might be due to the additional dependency;  another dependency gets
 tweaked in order to only include one file of each.  This will also not be
 necessary after a release anymore.

 >
 > Other than that, using iwakeh's `task-24175-stepbystep` branch, I was
 able to set up a development instance! (:

 Great!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23830#comment:11>
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