[OSGeoLive] #2473: Remove osgearth documentation

[OSGeoLive]

#2473: Remove osgearth documentation
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 Reporter:  cvvergara  |      Owner:  osgeolive@…
     Type:  task       |     Status:  new
 Priority:  normal     |  Milestone:
Component:  OSGeoLive  |   Keywords:
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 osgearth was hidden/retired on v11, the documentation is not used and
 needs to be removed.
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Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2473>
OSGeoLive <https://live.osgeo.org/>
self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything.