[heycam/webidl] Meta: update bikeshed install guide url (#947)

This PR updates the installation guide url in `Makefile`. (The current one doesn't look working now.)
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/947

-- Commit Summary --

  * Update bikeshed install guide url

-- File Changes --

    M Makefile (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/947.patch
https://github.com/heycam/webidl/pull/947.diff

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https://github.com/heycam/webidl/pull/947