Add `mindmaps.sh clean` command (#360)
Add `mindmaps.sh clean` command (#360)

* Add `mindmaps.sh clean` command

* Remove lying comment

graknlabs/grakn,graknlabs/grakn,graknlabs/grakn,lolski/grakn,lolski/grakn,graknlabs/grakn,lolski/grakn,lolski/grakn