[bug#50304] [PATCH] import: elpa: Support NonGNU ELPA.

[zimoun]

Hi,

For people who do not closely follow the Emacs ecosystem, the NonGNU
Elpa archive is an official archive maintained by GNU Emacs folks.
See the announce:

<https://lists.gnu.org/archive/html/emacs-devel/2020-08/msg00152.html>

On Tue, 31 Aug 2021 at 20:19, Xinglu Chen <public@yoctocell.xyz> wrote:
>
> * guix/import/elpa.scm (elpa-url): Add NonGNU ELPA URL.
> * doc/guix.texi (Invoking guix import): Document it.

LGTM.

All the best,
simon