[w3c/manifest] Update links to the WG (#871)

Web Platform WG -> Web Applications WG.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/871

-- Commit Summary --

  * Update links to the WG

-- File Changes --

    M README.md (4)
    M index.html (6)

-- Patch Links --

https://github.com/w3c/manifest/pull/871.patch
https://github.com/w3c/manifest/pull/871.diff

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