[w3c/push-api] Restructure the `push` event (#237)

This PR separates out the definition of the `push` event from the PushEvent interface and the action to take when receiving a message.

There's two changes that I'll point out specifically, the rest is moving things around.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/237

-- Commit Summary --

  * Restructure the `push` event

-- File Changes --

    M index.html (240)

-- Patch Links --

https://github.com/w3c/push-api/pull/237.patch
https://github.com/w3c/push-api/pull/237.diff

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