add mkdocs to slave3
add mkdocs to slave3

sebbASF/infrastructure-puppet,chtyim/infrastructure-puppet,apache/infrastructure-puppet,apache/infrastructure-puppet,sebbASF/infrastructure-puppet,chtyim/infrastructure-puppet,chtyim/infrastructure-puppet,chtyim/infrastructure-puppet,sebbASF/infrastructure-puppet,apache/infrastructure-puppet,apache/infrastructure-puppet,chtyim/infrastructure-puppet,sebbASF/infrastructure-puppet,sebbASF/infrastructure-puppet,chtyim/infrastructure-puppet,apache/infrastructure-puppet,sebbASF/infrastructure-puppet,sebbASF/infrastructure-puppet,sebbASF/infrastructure-puppet,apache/infrastructure-puppet,apache/infrastructure-puppet