[PostGIS] #5638: Need some more developer documentation

[PostGIS]

#5638: Need some more developer documentation
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  Reporter:  robe           |      Owner:  robe
      Type:  task           |     Status:  new
  Priority:  critical       |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  3.4.x
Resolution:                 |   Keywords:
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Changes (by robe):

 * priority:  medium => critical

Comment:

 A subset of this is #5961
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5638#comment:4>
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