[w3c/manifest] Added an Uninstallation section. (#678)

The section recommends other cleanup activities besides removing the
application.

Addresses #636.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/678

-- Commit Summary --

  * Added an Uninstallation section.

-- File Changes --

    M index.html (15)

-- Patch Links --

https://github.com/w3c/manifest/pull/678.patch
https://github.com/w3c/manifest/pull/678.diff

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