Add Kill Switch section

Currently there's a nasty bug which doesn't allow users from navigating
from the "Kill Switch" section to any other section of the app (see bug
twpowertools:59), but everything else is working.

Change-Id: I3c71352b1899e4ddf9ba5886aa1434a5a1ed93eb
diff --git a/frontend/src/store/index.js b/frontend/src/store/index.js
index 9dbf288..0666838 100644
--- a/frontend/src/store/index.js
+++ b/frontend/src/store/index.js
@@ -29,7 +29,12 @@
   },
   actions: {
     connectClient(store, host) {
+      // We enable the dev tools in case they are useful sometime in the future.
+      const enableDevTools = window.__GRPCWEB_DEVTOOLS__ || (() => {});
       store.state.client = new KillSwitchServicePromiseClient(host, null, null);
+      enableDevTools([
+        store.state.client,
+      ]);
     },
   },
 });