Re: [whatwg/streams] Meta: add a service worker to the spec (#637)

As always, the trickiest bit of offline-first is the UI. Some thoughts for how it could work:

1. Race the network & cache for a short amount of time (1 second?).
1. If the network wins - excellent! Serve it. Done!
1. if the cache wins, include UI that shows the date the content was last fetched, and a spinner while it's fetching.
1. If fetching fails, hide the spinner and notify the user.
1. If fetching succeeds:
  1. If the document hasn't been updated, hide the spinner, notify the user. Done!
  1. If the document has been updated, notify the user and give them a button to refresh the page.

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