views: be more generic about the poa network title

src/views/layout.jade

@@ -3,7 +3,7 @@ doctype html
 html(ng-app="netStatsApp")
   head
     meta(name="viewport", content="width=device-width, initial-scale=1.0, maximum-scale=1.0")
-    title Görli Network Status
+    title Testnet Network Status
     style(type="text/css") [ng\:cloak], [ng-cloak], [data-ng-cloak], [x-ng-cloak], .ng-cloak, .x-ng-cloak { display: none !important; }
     link(rel='stylesheet', href='/css/netstats.min.css')
     meta(name='robots', content='index,follow')