Updates X-Robot-Tag in nginx.conf examples (#1960)

* Update X-Robot-Tag in nginx.conf example

Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

* update nginx.conf examples

* Update .examples/docker-compose/insecure/mariadb/fpm/web/nginx.conf

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

* apply to all files

---------

Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>
Co-authored-by: J0WI <J0WI@users.noreply.github.com>