[MacPorts] #52275: neomutt: use github portgroup

[MacPorts]

#52275: neomutt: use github portgroup
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 Reporter:  ryandesign@…  |      Owner:  leonardo@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  neomutt
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 Ports for software hosted at GitHub should use the github 1.0 portgroup
 and the github.setup procedure. This patch makes this change to the
 neomutt portfile, thus eliminating several lines. May I commit it for you?

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Ticket URL: <https://trac.macports.org/ticket/52275>
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