[w3c/push-api] Run tidy (#249)

Looks like we missed a few chances to do this.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/249

-- Commit Summary --

  * Run tidy

-- File Changes --

    M index.html (437)

-- Patch Links --

https://github.com/w3c/push-api/pull/249.patch
https://github.com/w3c/push-api/pull/249.diff

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https://github.com/w3c/push-api/pull/249