[PROJ] More restrictive LLM policy - like in GDAL

[Mike Taves]

Thanks for the email list communication (a forum still absent of AI abuse).

GitHub users will have noticed a significant increase of LLM-gen-AI
content across many highly visible projects. This is obviously a
problem, and is unsustainable in the long run.

This seems to be related to GitHub. Read more down the rabbit hole
here https://giveupgithub.org

There are alternative code hosting systems, such as codeberg.org which
in contrast to GitHub has a transparent and democratic organisational
structure, which have recently voted to prohibit LLM-extrusions in
their terms of use
https://blog.codeberg.org/protecting-our-floss-commons-from-llms.html

Or there is an existing OSGeo Gitea resource: https://gitea.osgeo.org
which already mirrors several repos, like QGIS and GEOS (but not
PROJ).