Update README.md

Corrected content to reflect OpenCost, not Kubecost

Signed-off-by: bstuder99 <81711774+bstuder99@users.noreply.github.com>

ui/README.md

@@ -22,10 +22,10 @@ npx parcel src/index.html
 ```
 
 This will launch a development server, serving the UI at `http://localhost:1234` and targeting the data for an instance of
-Kubecost running at `http://localhost:9090`. To access an arbitrary Kubecost install, you can use
+OpenCost running at `http://localhost:9090`. To access an arbitrary OpenCost install, you can use
 
 ```
-kubectl port-forward deployment/kubecost-cost-analyzer 9090
+kubectl port-forward deployment/opencost-cost-analyzer 9090
 ```
 
 for your choice of namespace and cloud context.