[SAC] [OSGeo] #2921: Make gitea official url be gitea.osgeo.org

[OSGeo]

#2921: Make gitea official url be gitea.osgeo.org
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 Reporter:  strk    |      Owner:  strk
     Type:  task    |     Status:  new
 Priority:  normal  |  Milestone:  Unplanned
Component:  Gitea   |   Keywords:
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 And drop a redirect from git.osgeo.org/gitea to gitea.osgeo.org

 The reason for using the subdir was a least-change approach to
 infrastructure. Nowadays it looks like we are more flexible in how we do
 things...
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2921>
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