[whatwg/streams] Add two demos using streams for PNG manipulation (#911)

I added two demos I wrote for MDN to the list of your demos, if you'd like!

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

  https://github.com/whatwg/streams/pull/911

-- Commit Summary --

  * Add two demos using streams for PNG manipulation

-- File Changes --

    M demos/index.html (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/911.patch
https://github.com/whatwg/streams/pull/911.diff

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