[AMP Story Docs] Animation information hard to find

[alankent]

[UPDATED: July 28 - I removed some erroneous assumptions about there being an animation trigger that fires when a video finishes playing in amp-video.]

I went to amp-story-page looking for animation, but there was no mention of animation anywhere on page. I went to amp-story and it does contain an animation section talking about what you can do on amp-story-page elements. This felt strange (animation did mention amp-story-page, but that page does not mention animation at all).

amp-story also referenced amp-story-animation for advanced animation, which is not shown in the list of elements under the "web stories" list of components in the docs.

This suggestion is to

• Add a reference on the amp-story-page web component page to the amp-story page regarding animation
• Consider whether amp-story-animation should be added to the list of documented components on the site.