Fixed main url

gatsby-config.js

@@ -5,7 +5,7 @@ module.exports = {
     defaultTitle: `EIC Software`,
     siteTitleShort: `EIC software`,
     siteDescription: `Electron ion collider simulation software tutorial`,
-    siteUrl: `https://argonne_eic.gitlab.io/tutorial/eic_tutorial`,
+    siteUrl: `https://eic.phy.anl.gov/tutorials/eic_tutorial`,
     siteAuthor: `whit`,
     siteImage:`/banner.png`,
     siteLanguage: `en`,