[w3ctag/packaging-on-the-web] Why not the non-zip formats? (#31)

The [Introduction](https://w3ctag.github.io/packaging-on-the-web/#intro) explains why not to use a Zip-based format, but several of the options, including MHTML, aren't zip-based and are more widely-supported than this new proposal. The Introduction should explain why we need something new.

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