[PostGIS] #6125: Document hugo version requirements for website building

[PostGIS]

#6125: Document hugo version requirements for website building
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  Reporter:  strk         |      Owner:  robe
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  Website Management, Bots
 Component:  website      |    Version:
Resolution:               |   Keywords:
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Changes (by strk):

 * type:  defect => enhancement

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6125#comment:1>
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