docs(contributing.md): updated the instructions for initalizing and cleaning the couchdb database
docs(contributing.md): updated the instructions for initalizing and cleaning the couchdb database

The instructions now refer to the new scripts in couchdb.

HospitalRun/hospitalrun-frontend,HospitalRun/hospitalrun-frontend,HospitalRun/hospitalrun-frontend,HospitalRun/hospitalrun-frontend