Because of deprecation according to author.

Reference: https://github.com/avocado-framework/avocado/issues/3074Signed-off-by: NCleber Rosa <crosa@redhat.com>

Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

Our "other resources" section is fairly limited, let's add new items.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

With a single item, but as a place holder for all docs, articles and
even videos out there covering Avocado usage.
Signed-off-by: NCleber Rosa <crosa@redhat.com>