[tor-bugs] #7760 [Ooni]: Add installation instructions for OONI to the documentation

[Tor Bug Tracker & Wiki]

#7760: Add installation instructions for OONI to the documentation
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 Reporter:  aagbsn  |          Owner:  hellais
     Type:  task    |         Status:  new    
 Priority:  normal  |      Milestone:         
Component:  Ooni    |        Version:         
 Keywords:          |         Parent:  #7376  
   Points:          |   Actualpoints:         
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 Currently the documentation links to the README.md hosted on github:
  https://github.com/hellais/ooni-probe#getting-started

 We should add this or a similar page into the documentation on
 ooni.torproject.org/docs, or at the very least point the url to
 gitweb.torproject.org

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7760>
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