Add topics to House as per #793. (#974)
Add topics to House as per #793. (#974)

* Add topics to House as per #793.

* Amend 'house' topics in config.json

* Remove tag 'variables' from house topics.

exercism/xjava,jmluy/xjava,exercism/xjava,FridaTveit/xjava,jmluy/xjava,FridaTveit/xjava