[web] Use the new '/ajax' URL path to access the AjaxController (closes #2758254)
5a81fa526b30 took care of all the JS code, this patch cleans up the
remaining python bits.
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0