Move legacy and new code
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3556790. --> Reported by: [saschaeggi](https://www.drupal.org/user/1999056) Related to !718 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Move "new" Code based on Claro into root directory from <code>merge</code> and move Gin's overrides into an <code>migration</code> folder.</p> <ul> <li><code>merge</code> &rarr; <code>root</code></li> <li><code>dist</code> &rarr; <code>migration</code></li> </ul>
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