This reverts commit 7f5d5290.

already included in mesh-batman-adv-15 feature since https://github.com/freifunk-gluon/gluon/commit/1a690d2fd6fc564532d266035ba114940f4393b5

source: https://github.com/Freifunk-Rhein-Sieg/ffrsk-site/blob/tools/patches/package/101-add-respondd-clientdev.patch

and add debug information to README, how to check all lua files

# Conflicts:
#	.gitlab-ci/build.sh

# Conflicts:
#	make-release.sh
#	release
#	site.mk

the value batman_adv.routing_algo must be set in site.conf now. It is not alowed to leave it empty any more

[skip ci]