Update installation docs for consistency
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3578126. --> Reported by: [pameeela](https://www.drupal.org/user/1431110) Related to !839 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>We have varying steps for setup with DDEV in different places, we should standardise on a single set of commands.</p>
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