Note transpiler service broken (#3799)

The new release of the AI transpiler service still does not work with
the new platform. This PR adds a caution admonition to the transpiler
service page to warn users that the guide page will not work and that
they should use the local ai mode instead.

Closes: #3536

---------

Co-authored-by: abbycross <[email protected]>

Author: kaelynj

docs/guides/qiskit-transpiler-service.ipynb

@@ -25,16 +25,19 @@
    "id": "2704ef01-ddde-47a0-9a14-a70bbc72b326",
    "metadata": {},
    "source": [
-    "The Qiskit Transpiler Service provides transpilation capabilities on the cloud. In addition to the local Qiskit transpiler capabilities, your transpilation tasks can benefit from both IBM Quantum® cloud resources and AI-powered transpiler passes.\n",
+    "<Admonition type=\"danger\" title=\"Transpiler Service migration\">\n",
+    "     As of 18 July 2025, the service is being migrated to support the new IBM Quantum&reg; Platform and is not available. For AI passes, you can use [local mode](/docs/guides/ai-transpiler-passes#run-the-ai-transpiler-passes-locally-or-on-the-cloud).\n",
     "\n",
-    "The Qiskit Transpiler Service offers a Python library to seamlessly integrate this service and its capabilities into your current Qiskit patterns and workflows.\n",
-    "\n",
-    "<Admonition type=\"note\">\n",
-    "    This service is only available for IBM Quantum Premium Plan, Flex Plan, and On-Prem (via IBM Quantum Platform API) Plan users. As of 18 July 2025, the service is being migrated and might not be available. For AI passes, you can use [local mode](/docs/guides/ai-transpiler-passes#run-the-ai-transpiler-passes-locally-or-on-the-cloud).\n",
     "    The service is a beta release, subject to change.\n",
     "    If you have feedback or want to contact the developer team, please use this [Qiskit Slack Workspace](https://qiskit.slack.com/archives/C06KF8YHUAU) channel.\n",
     "</Admonition>\n",
     "\n",
+    "\n",
+    "The Qiskit Transpiler Service provides transpilation capabilities on the cloud. In addition to the local Qiskit transpiler capabilities, your transpilation tasks can benefit from both IBM Quantum cloud resources and AI-powered transpiler passes.\n",
+    "\n",
+    "The Qiskit Transpiler Service offers a Python library to seamlessly integrate this service and its capabilities into your current Qiskit patterns and workflows. This service is only available for IBM Quantum Premium Plan, Flex Plan, and On-Prem (via IBM Quantum Platform API) Plan users.\n",
+    "\n",
+    "\n",
     "<span id=\"install-transpiler-service\"></span>\n",
     "## Install the qiskit-ibm-transpiler package\n",
     "\n",