Add catImagesPromise to main component

We rely on this property, might as well add it to the component
and its associated blueprint.
Update component /ui/main.reel/
Update component /ui/main.reel/
Update component /ui/main.reel/main.js
Update component /ui/main.reel/main.html
Update component /ui/main.reel/
Update component /ui/main.reel/main.js
Update component /ui/main.reel/main.js
Update component /ui/main.reel/
Merge remote-tracking branch 'mike/main-blueprint'