Refine Mercury's starter kit configuration
>>> [!note] Migrated issue
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Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !42
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<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>When you use Mercury as a starter kit, we probably want to make sure you start in a consistent state, with consistent dependencies, and that everything is copied as we expect it to be. Let's lock all that in before stable.</p>
issue