[web] add new Kioubit Auth button

web/frontend/login.html

@@ -5,7 +5,7 @@
 <form action="https://dn42.g-load.eu/auth/">
   <link
     rel="stylesheet"
-    href="https://dn42.g-load.eu/auth/assets/button-font/auth.css"
+    href="{{config['base-dir']}}static/auth.css"
   />
   <input
     type="hidden"
@@ -15,9 +15,16 @@
   />
   <button
     type="submit"
-    class="kioubit-btn kioubit-btn-primary kioubit-btn-dark kioubit-btn-main"
+    class="kioubit-btn-dark"
   >
-    <span class="icon-kioubit-auth"></span>Authenticate with Kioubit.dn42
+    <object
+      width="35px"
+      height="35px"
+      type="image/svg+xml"
+      data="{{config['base-dir']}}static/auth.svg"
+      class="kioubit-btn-logo"
+    ></object>
+    Authenticate with Kioubit.dn42
   </button>
 </form>