Add clustering page to 0.13
Add clustering page to 0.13

influxdb/docs.influxdata.com,Tomcat-Engineering/docs.influxdata.com,influxdata/docs.influxdata.com,influxdata/docs.influxdata.com,Tomcat-Engineering/docs.influxdata.com,Tomcat-Engineering/docs.influxdata.com,influxdb/docs.influxdata.com,influxdb/docs.influxdata.com,influxdata/docs.influxdata.com,influxdata/docs.influxdata.com,influxdata/docs.influxdata.com