Add instuctions to remove the existing edge

Change-Id: I6091996f46e928f7f7b1342bb5f0637d28564b5e
diff --git a/index.rst b/index.rst
index 97d4a4b..b48673b 100644
--- a/index.rst
+++ b/index.rst
@@ -58,6 +58,7 @@
    edge_deployment/sdfabric_deployment
    edge_deployment/connectivity_service_update
    edge_deployment/enb_installation
+   edge_deployment/site_remove
    edge_deployment/troubleshooting
    edge_deployment/pronto