Renaming the team page to utrechtteam

As oceanparcels.org/utrechtteam was also the web address used before, so we don't get broken links

Author: erikvansebille

src/data/footer-items.js

@@ -44,6 +44,6 @@ export const footerItems = {
       label: 'Issue Tracker',
       href: 'https://github.com/OceanParcels/parcels/issues',
     },
-    { label: 'Utrecht Team', href: '/team' },
+    { label: 'Utrecht Team', href: '/utrechtteam' },
   ],
 }