nginx: redirect mastoon handles

nginx/www.conf

@@ -37,6 +37,11 @@ server {
 		return 302 https://${KEYCLOAK_HOSTNAME}.${DOMAIN_NAME}$request_uri;
 	}
 
+	# redirect mastodon handles (which start with @) directly to mastodon site
+	location ~ ^/@ {
+		return 302 https://${MASTODON_HOSTNAME}.${DOMAIN_NAME}$request_uri;
+	}
+
 	# tilde club home directories
 	location ~ ^/~(.+?)(/.*)?$ {
 		alias /home/$1/public_html$2;