This commit removes the broken flag from all devices in the mt76x8
subtarget.

The stability of the mt76 driver for the mt7628 and mt7612 has greatly
improved in the last half-year. It might be still behind ath9k and
ath10k but it is suitable for daily use.

This affects the following devices:

 - GL.iNet MT300N v2
 - TP-Link Archer C50 v3
 - TP-Link TL-WR841 v13

Signed-off-by: Martin Weinelt <martin@darmstadt.freifunk.net>

Adds a footnote with a link to an instruction on how to flash Gluon onto
AVM routers.

Signed-off-by: David Bauer <mail@david-bauer.net>

The driver has stablized enough to officially support ramips-mt76x8 devices
again. At least remove BROKEN for VoCore 2 (as it was supported before).

The ramips-mt76x8 target is marked as BROKEN.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>

I just followed this document on a Debian Stretch, and it worked out of
the box. So let's use Debian's current stable release here.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>

Signed-off-by: Martin Weinelt <martin@darmstadt.freifunk.net>

fixes #1561

Before 7827f896, mandatory hostname field in config mode was
pre-filled with the default hostname.

This commit adds the config_mode.hostname.prefill option for
controlling the default value.