chore(copyedit): copyedits to feature page text

Author: naomiblack

public/_data.json

@@ -6,8 +6,7 @@
   },
 
   "features": {
-    "title": "Features & Benefits",
-    "subtitle": "Powerful Features for Developing Apps"
+    "title": "Features & Benefits"
   },
 
   "contribute": {
@@ -17,8 +16,7 @@
   },
 
   "news": {
-    "title": "News",
-    "subtitle": "Check out what we are up to"
+    "title": "News"
   },
 
   "events": {

public/features.jade

@@ -3,7 +3,7 @@ div
     h2(class="text-headline") Cross Platform
     div(class="feature-row")
       div(class="feature")
-        h3 Progressive Web App
+        h3 Progressive Web Apps
         p(class="text-body") Use modern web platform capabilities to deliver app-like experiences.  High performance, offline and zero-step installation.
 
       div(class="feature")