[w3c/manifest] Adding Edge & WebKit implementation status links (#606)

I also alphabetized the links.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/606

-- Commit Summary --

  * Adding EdgeHTML
  * Adding WebKit
  * Alphabetizing Implementation Status

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/manifest/pull/606.patch
https://github.com/w3c/manifest/pull/606.diff

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https://github.com/w3c/manifest/pull/606