[w3c/manifest] feat: add category member (resolves #569) (#598)

See discussion in #569 

Signed-off-by: Rob Dolin <robdolin@microsoft.com>

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

  https://github.com/w3c/manifest/pull/598

-- Commit Summary --

  * feat: add category member (resolves #569)
  * Update processing the manifest section
  * Remove duplicate section

-- File Changes --

    M index.html (95)

-- Patch Links --

https://github.com/w3c/manifest/pull/598.patch
https://github.com/w3c/manifest/pull/598.diff

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