[heycam/webidl] Update links to ES2017. (#114)

jorendorff's unofficial HTML version already redirects there, so there's no
point in linking to that URL.

This commit only updates the links; more work is needed to ensure all
references are still correct in ES2017.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/114

-- Commit Summary --

  * Update links to ES2017.

-- File Changes --

    M index.html (511)
    M index.xml (145)

-- Patch Links --

https://github.com/heycam/webidl/pull/114.patch
https://github.com/heycam/webidl/pull/114.diff

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