feat(github): twitter username for orgs

lib/screens/gh_user.dart

@@ -360,6 +360,15 @@ class GhUserScreen extends StatelessWidget {
                         launchStringUrl(url);
                       },
                     ),
+                  if (p.twitterUsername != null)
+                    AntListItem(
+                      prefix: const Icon(Ionicons.logo_twitter),
+                      child: Text('@${p.twitterUsername!}'),
+                      onClick: () {
+                        launchStringUrl(
+                            'https://twitter.com/${p.twitterUsername}');
+                      },
+                    ),
                 ],
               ),
               CommonStyle.verticalGap,

packages/gql_github/lib/user.graphql

@@ -98,6 +98,7 @@ query User($login: String!) {
     location
     email
     websiteUrl
+    twitterUsername
     createdAt
     viewerIsFollowing
     sponsors {