Deletion of House Cannith

Comment: and strongly trim.  In their current state, articles like House Deneith are also badly lacking in context, so merge Dragonmarked house and all the above articles to a new Houses of Eberron. Context and notability could be established per , since Eberron has been the subject of published works, awards, etc
Stance: merge
Cited policy: Wikipedia:Notability (WP:NOTE)