[whatwg/streams] Meta: update contribution guidelines (PR #1301)

These have not kept up with changes to the spec's editorial conventions and build tooling.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1301

-- Commit Summary --

  * Meta: update contribution guidelines

-- File Changes --

    M CONTRIBUTING.md (33)

-- Patch Links --

https://github.com/whatwg/streams/pull/1301.patch
https://github.com/whatwg/streams/pull/1301.diff

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