[tor-bugs] #20380 [Metrics/CollecTor]: Expand INSTALL.md to a more complete operator's guide

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#20380: Expand INSTALL.md to a more complete operator's guide
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 Reporter:  karsten            |          Owner:
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by karsten):

 Pushed some changes along those lines to my branch.  Now preparing the
 release.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20380#comment:21>
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