[heycam/webidl] Mark legacy content as deprecated. (#332)

Add toggler to mute deprecated content.
Store its state in localstorage.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/332

-- Commit Summary --

  * Mark legacy content as deprecated.

-- File Changes --

    M index.bs (1244)

-- Patch Links --

https://github.com/heycam/webidl/pull/332.patch
https://github.com/heycam/webidl/pull/332.diff

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