[heycam/webidl] Reorganize the Interfaces and Interface mixins sections. (#784)

Besides the more strict definitions of interface members and interface
mixin members, this should be editorial.

It is intended to make the sections flow better and to gather related
content into smaller and more easily digestible subsections.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/784

-- Commit Summary --

  * Reorganize the Interfaces and Interface mixins sections.

-- File Changes --

    M index.bs (366)

-- Patch Links --

https://github.com/heycam/webidl/pull/784.patch
https://github.com/heycam/webidl/pull/784.diff

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