chore(docs): refactor the charts, rbac & engine manifests (#324)

Signed-off-by: shubhamchaudhary <shubham.chaudhary@mayadata.io>

charts/cassandra/cassandra-pod-delete/experiment.yaml

@@ -62,7 +62,7 @@ spec:
     # provide cassandra port 
     # default port: 9042
     - name: CASSANDRA_PORT
-      value: ''
+      value: '9042'
 
     # provide liveness deployement port
     # default port: 8088, It only supports 8088 port
@@ -92,10 +92,6 @@ spec:
     - name: RAMP_TIME
       value: ''
 
-    # provide the kill count
-    - name: KILL_COUNT
-      value: ''
-
     - name: FORCE
       value: ''