[BUG]: Hijacked domain is confusing

[lgritz]

Required prerequisites

• Make sure you've read the documentation. Your issue may be addressed there.
• Search the issue tracker and Discussions to verify that this hasn't already been reported. +1 or comment there if it has.
• Consider asking first in the Gitter chat room or in a Discussion.

What version (or hash if on master) of pybind11 are you using?

main

Problem description

If you accidentally go to, or clone, https://github.com/pybind11/pybind11 (instead of the correct pybind/pybind11, and this is a very easy mistake to make), you get redirected to the wrong place that seems like a security POC but could cause people real trouble.

Reproducible example code

Is this a regression? Put the last known working version here if it is.

Not a regression