Resolve "create header"

Closes #4 (closed)

docusaurus.config.js

@@ -26,7 +26,11 @@ module.exports = {
         {to: "/dummy_page", label: "Tarifs", position: "left"},
         {to: "/blog", label: "Blog", position: "left"},        
         {type: "doc", docId: "intro", position: "left", label: "Doc",},
-        {to: "/dummy_page", label: "Login", position: "right"},
+        {
+          href: "https://lab.frogg.it/users/sign_in",
+          label: "Connexion",
+          position: "right",
+        },
         {to: "/dummy_page", label: "S'enregister", position: "right"},
       ],
     },