fix: attach csrf token to requests from htmx

Author: NagariaHussain

htmx_portal/www/book-shelf.html

@@ -49,4 +49,10 @@
     </main>
 </body>
 
+<script>
+    document.body.addEventListener('htmx:configRequest', function (evt) {
+        evt.detail.headers['X-Frappe-CSRF-Token'] = "{{ frappe.session.csrf_token }}";
+    });
+</script>
+
 </html>