Core: Disable sidebar and don't load refs when singleStory=true

[ghengeveld]

Issue: #15171

What I did

This retrieves the singleStory query param and passes it as a boolean to initializing modules.

• The layout module uses it to prevent showNav from ever becoming true (i.e. ignore the toggle).
• The url module uses it to set showNav: false when creating the initial layout state.
• The refs module uses it to not initialize any refs and prevent refs from being added.

I also refactored the url params handling to be more straightforward with less if/else and a consistent way to handle boolean params.

How to test

• Is this testable with Jest or Chromatic screenshots? no
• Does this need a new example in the kitchen sink apps? no
• Does this need an update to the documentation? no

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

Looking good!

[shilman]

parseBoolean?

[ghengeveld]

It's in a different module, so I can't directly access it. Also singleStory is a new param which is not supposed to support '1', but only 'true'.