Update social links menu to use phosphor icons
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3554395. --> Reported by: [pameeela](https://www.drupal.org/user/1431110) Related to !6 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Mercury includes two icon libraries, phosphor and one specifically for social icons. But the reason we chose phosphor is that it provides the social icons that we want, so we should update the social links menu to use these and then we can remove social from Mercury.</p>
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