[w3c/selection-api] Fix links (#91)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/91

-- Commit Summary --

  * Use https links where possible
  * Replace link to whatwg archive with working equivalent

-- File Changes --

    M index.html (56)

-- Patch Links --

https://github.com/w3c/selection-api/pull/91.patch
https://github.com/w3c/selection-api/pull/91.diff

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