[MacPorts] #58656: Show URL in "port info"

[MacPorts]

#58656: Show URL in "port info"
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  Reporter:  FranklinYu   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 I don't know that I would necessarily display the Portfile's GitHub URL in
 the `port info` output. `port info` should be for users; the GitHub URL is
 for developers. Once the GSoC '19 MacPorts Web App is finished and
 deployed, we'll have user-facing pages for each port; we could display
 that URL in `port info`.

 However, I do have a shell function set up on my own system which gives me
 a `port gh` command that opens a Portfile's GitHub URL, so I realize that
 this can be useful.

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Ticket URL: <https://trac.macports.org/ticket/58656#comment:5>
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