The *Firmware Selector* was built to simplify users finding suitable
images for their devices. Let's give it more visibility so unleashing
your home router becomes an easier thing.

As an alternative for more advanced user, provide the directl link to
the wiki download section.

Signed-off-by: Paul Spooren <mail@aparcar.org>
[ fix typo in commit description, add link to Wiki download page ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>