chore(demo): list images not found (#5242)

Change path https://angular.io/resources/images/… to https://angular.io/generated/images/…

Author: Philip Sultanescu

src/demo-app/list/list-demo.ts

@@ -25,19 +25,19 @@ export class ListDemo {
       from: 'Nancy',
       subject: 'Brunch?',
       message: 'Did you want to go on Sunday? I was thinking that might work.',
-      image: 'https://angular.io/resources/images/bios/julie-ralph.jpg'
+      image: 'https://angular.io/generated/images/bios/julie-ralph.jpg'
     },
     {
       from: 'Mary',
       subject: 'Summer BBQ',
       message: 'Wish I could come, but I have some prior obligations.',
-      image: 'https://angular.io/resources/images/bios/juleskremer.jpg'
+      image: 'https://angular.io/generated/images/bios/juleskremer.jpg'
     },
     {
       from: 'Bobby',
       subject: 'Oui oui',
       message: 'Do you have Paris reservations for the 15th? I just booked!',
-      image: 'https://angular.io/resources/images/bios/jelbourn.jpg'
+      image: 'https://angular.io/generated/images/bios/jelbourn.jpg'
     }
   ];