treewide: move freifunk-related packages to separate repo

treewide: move freifunk-related packages to separate repo

Even Freifunk was one of the major factory to create the LuCI-system, it's
now only a very small part of LuCI. LuCI has become a much bigger thing
and it seems that it's time to move the packages only relating to Freifunk
into it's own feed.
On the mailinglist it was discussed [1] and a repo below the general
Freifunk team on github was created.

This commit removes all packages that will be hosted in the new repo [2]

1 - http://lists.freifunk.net/pipermail/wlannews-freifunk.net/2019-February/004818.html
2 - https://github.com/freifunk/openwrt-packages

Signed-off-by: Sven Roederer <redacted>