excaliburjs / Excalibur / 20043466179 / 1

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docs: add deferred mount to playground ember (#3618)

No issue, but discussed in Discord. 

Closes #

## Changes:

- Adds an intersection observer so embedded Playgrounds can optionally mount after they come into view


Can be seen on this preview page: https://fix-playground-intersection.excaliburjs.pages.dev/docs/physics

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