docs/website: fix favicon
When the favicon image was added in f26e61319f3f (docs/website: add
favicon.png), it was added to a different directory then where the header's
icon link points. This causes the favicon to fail to load with 404.
While we are here, remove the "shortcut" rel attribute as it is non-standard
and it's recommended not to use it[1].
[1] https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel#sect4
Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Brandon Maier