Correct Elizabeth's mastodon link. (#255)

The old URL bounced (unnecessarily and slightly jarringly) through mastodon.social

Author: sgolemon

source/_pages/structure.html

@@ -18,7 +18,7 @@ <h2 class="text-3xl text-gray-800 font-bold tracking-tight mt-0" id="staff">Staf
                         name: 'Elizabeth Barron',
                         image: '/assets/team/elizabeth_barron.jpeg',
                         job: 'Executive Director',
-                        mastodon: 'https://mastodon.social/@elizabeth@fosstodon.org',
+                        mastodon: 'https://fosstodon.org/@elizabeth',
                         linkedin: 'https://www.linkedin.com/in/elizabethn',
                     }) }}