x86-generic is still marked as broken as fastd v16 doesn't work with uClibc on
x86. This will be fixed with fastd v17.

docs/site-example: cleanup

docs: add mesh_vlan entry

Documentation and helper script for the new upgrade script handling

docs: skipping of setup mode

This PR documents functionality added by
https://github.com/freifunk-gluon/packages/pull/95

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

 - generalize, to make it more clear that the site config
   needs to be adapted to the local community.
 - remove some host names and public keys used in Lübeck
 - suggest private space mac adresses
 - change fastd method to salsa2012+umac, which is the recommended default
 - add config for a fastd peer reachable by both ipv4 and ipv6
 - order GLUON_SITE_PACKAGES alphabetically

Add support for Netgear WNDR3700/3800