[PostGIS] #6105: many of the static image examples in the docs are gone

[PostGIS]

#6105: many of the static image examples in the docs are gone
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 Reporter:  robe           |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  blocker        |  Milestone:  PostGIS 3.7.0
Component:  documentation  |    Version:  master
 Keywords:                 |
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 It's especially apparent when looking at the SFCGAL examples.

 These should have been left as static images instead of trying to convert
 to SVG. SVG doesn't support 3D so all the examples it replaced with are
 more or less trivial.

 E.g.
 See the difference example:
 New
 https://postgis.net/docs/manual-dev/en/CG_3DIntersection.html

 v.s
 Old
 https://postgis.net/docs/manual-3.6/en/CG_3DIntersection.html

 The union example:

 New
 https://postgis.net/docs/manual-dev/en/CG_3DUnion.html

 Old
 https://postgis.net/docs/manual-3.6/en/CG_3DUnion.html
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6105>
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