doc: Simplify installation instructions

* doc/guix.texi (Installation):
- Move the definition of "foreign distro" out of quotation
- Repeat overwrite warning
- Remove superfluous commentary

* doc/guix.texi (Binary Installation):
- Clarify that installing on a foreign distro has two methods: using
  packaged binaries and building from source
- Add cross reference to "Building from Git"
- Move the foreign distro installation instructions out of quotation
- Move directions for 'guix-install.sh' after instructions to use
  distribution-specific package managers
- Specify "distributions" as "GNU/Linux distributions"
- Add GnuPG as a requirement for 'guix-install.sh'
- Add comma after "Likewise"
- Remove redundant instructions to use 'guix-install.sh'
- Split the requirements between system requirements for binary
  installations, GNU/Linux or GNU/Hurd, and requirements for running
  'guix-install.sh'
- Clarify that 'guix-install.sh' guides users through the steps
- Summarize the steps 'guix-install.sh' follows rather than try to
  detail them
- Make explicit that the 'guix-install.sh' default is to download
  substitutes
- Emphasize that the substitute authorization code is an example and
  may need modification

Link: <https://lists.gnu.org/archive/html/guix-devel/2024-03/msg00023.html>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

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