bug#71700: The Archiving functionality of guix lint should be opt-in and Documented more prominently

[MSavoritias]

Hey,

There was recently a discussion around SWH and it came up that `guix lint` 
actually by default when you run it without arguments, runs all the linters.
One of them being the archive linter that contacts SWH archive to let it know 
where to download the source code from (if its a public repo).

I would like to propose to make that linter off by default. Because:

The tool is name `guix lint` and it is not obvious (unless somebody runs 
--list-linters after --help) that it also does code archiving.
To that end it breaks the expectations of the person using the tool to have 
their code silently uploaded to SWH. (if its a public repo again)

What we should do instead:

Instead we should document more prominently in the manual that `guix lint` also 
does archiving and encourage people to actually archive the software they write 
to SWH.
(assuming they are the authors that is. A disclaimer to get permission from the 
author of the software should be also added if they are not.)
And for the usecase of Guix, they flag can just be turned on by default since 
as a project we are interested in code archival.

MSavoritias