[MacPorts] #39321: Remove old documentation

[MacPorts]

#39321: Remove old documentation
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 Reporter:  marius@…  |      Owner:  macports-tickets@…
     Type:  update    |     Status:  new
 Priority:  Low       |  Milestone:  MacPorts Future
Component:  base      |    Version:  2.1.3
 Keywords:  old doc   |       Port:  macports
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 Remove old documentation from /trunk/doc. It is no longer used and it is
 just confusing. Also rename doc-new, as it is no longer new.

 P.S. I would like to resolve this myself, as a practice task. Just give me
 the green light.

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Ticket URL: <https://trac.macports.org/ticket/39321>
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