AETHER-2090 Add system applications and bess-upf deployment guide

Change-Id: Ie456057f1a9652c02634221009ee5cebe63d8098
diff --git a/index.rst b/index.rst
index 73d5499..b5c1c13 100644
--- a/index.rst
+++ b/index.rst
@@ -29,6 +29,7 @@
    edge_deployment/fabric_switch_bootstrap
    edge_deployment/vpn_bootstrap
    edge_deployment/runtime_deployment
+   edge_deployment/bess_upf_deployment
    edge_deployment/tost_deployment
    edge_deployment/connectivity_service_update
    edge_deployment/enb_installation