Mitchell Hentges a3eb85e571 Bug 1687980: Make macOS quickstart docs more concise r=sylvestre,mhoye
* Puts the docs in order, so that contributors aren't jumping to the
  middle of the page to install system tools, then back to the top to
  clone Firefox.
* Removes docs on MacPorts since it's being removed in bug 1688263.
* Removes step to manually install brew packages since that happens
   automatically in bootstrap now.
* Simplifies mercurial installation docs
* Removes unnecessary mozconfig-tweaking instructions
* Removes almost-always-unnecessary DEFINE and troubleshooting
  information.

Differential Revision: https://phabricator.services.mozilla.com/D102973
2021-02-16 17:48:11 +00:00
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