Add a little bit of "big picture" documentation that explains some very high-level things about Canvas
>>> [!note] Migrated issue
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Reported by: [phenaproxima](https://www.drupal.org/user/205645)
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<h3 id="overview">Overview</h3>
<p>I once wrote some very high-level documentation for the basics of Canvas: <a href="https://gist.github.com/phenaproxima/75e32efe60e67406b9e7d29b98e4bdd8">https://gist.github.com/phenaproxima/75e32efe60e67406b9e7d29b98e4bdd8</a></p>
<p>I think this ought to be updated, then added to Canvas' official docs, as a nice onboarding for people who are new to it.</p>
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