Bug 36322: Redirect docs dir to 404

Bug 36322: Redirect docs dir to 404

http://localhost:8081/cgi-bin/koha/docs/CAS/CASProxy/examples/proxy_cas.pl

Test plan:
Hit the link
=> Erk
Copy the apache config to /etc/koha/apache-shared-intranet-git.conf
restart_all
Hit the link
=> 404

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 0cf08303932eea945d5c90cca0d5ca18fe8923d6)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 01f70904548e64c73f0ddd81a5559b5c3c69b620)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>