[whatwg/streams] Make the table of contents more useful/less dense (#885)

Streams is a bit different in structure from other specifications in that it uses a heading for every API surface and abstract operation. This leads to a much larger table of contents than other specifications, and as such, I think the TOC is not very useful in its current form.

I think we should omit:

- Everything under "Class `X`"
- Every abstract operation (but keep the categories, e.g. keep "General Readable Stream Abstract Operations")

This can be done by adding `class="no-toc"` to the appropriate headings in the `index.bs` document.

Marking this as a "good first issue" in case anyone wants to help out.

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