Replace huge PDFs with smaller JPGs

Author: jkmassel

WordPress/Resources/AppImages.xcassets/New Jetpack prologue/JPBackground.imageset/Contents.json

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "background-light.pdf",
+      "filename" : "background-light 1.jpg",
       "idiom" : "universal"
     }
   ],

WordPress/Resources/AppImages.xcassets/New Jetpack prologue/JPBackground.imageset/background-light 1.jpg

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "stats-revamp-v2-feature-intro-preview.pdf",
+      "filename" : "stats-revamp-v2-feature-intro-preview.jpg",
       "idiom" : "universal"
     }
   ],