dashboard: remove default API_URL value (#85)

Author: pepakriz

dashboard/next.config.js

@@ -1,6 +1,6 @@
 module.exports = {
 	env: {
-		API_URL: process.env.API_URL || 'http://127.0.0.4:4000/graphql',
+		API_URL: process.env.API_URL,
 		WS_URL: process.env.WS_URL,
 	},
 	exportPathMap: function () {