[MacPorts] #70723: libavif: Move documentation to docs variant or subport

[MacPorts]

#70723: libavif: Move documentation to docs variant or subport
-------------------------+----------------------
 Reporter:  ryandesign   |      Owner:  mascguy
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  libavif
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 libavif depends on pandoc to produce its documentation. pandoc is a heavy
 dependency because it depends on ghc and ultimately over 500 other ports.
 gd2 is included in its recursive dependencies which means that gd2 cannot
 enable its libavif support.

 Please move libavif documentation to a docs variant or a libavif-docs
 subport so that depending on libavif is less costly.

 This was previously mentioned in #69332, #69566,  and #70546.

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Ticket URL: <https://trac.macports.org/ticket/70723>
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