[SAC] [OSGeo] #2774: Move planet.osgeo.org to osgeo3 geo-docs

[OSGeo]

#2774: Move planet.osgeo.org to osgeo3 geo-docs
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2022-II
Component:  Systems Admin  |   Keywords:
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 planet.osgeo.org is currently house on old-webextra (which is still
 running wheezy).  I think I've moved most things off of it.  This is one I
 haven't moved yet.

 Plan is to move it to osgeo3-geo-docs which is not currently used for
 anything at moment (though plans to house geo related docs like geoserver-
 docs and geotools-docs here).  These are all light-weight things.

 Challenge with planet is that it relies on I think python2.  I had similar
 issue getting planet.postgis.net to run on newer debian (which is a fork
 of the planet.osgeo.org).  So I think I can work around this issue.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2774>
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