Drop YouTube as well

Suggested-by: Stefan van der Walt <stefanv@berkeley.edu>
Co-Authored-By: Stefan van der Walt <45071+stefanv@users.noreply.github.com>

Author: agriyakhetarpal

doc/config.yaml

@@ -56,8 +56,6 @@ params:
     socialmedia:
       - link: https://github.com/scientific-python/
         icon: github
-      - link: https://www.youtube.com/c/ScientificPython-org
-        icon: youtube
       - link: https://fosstodon.org/@scientific_python
         icon: mastodon
       - link: https://discuss.scientific-python.org