Add instructions to delete account and account data (Qiskit#1557)

Closes Qiskit#1504.

---------

Co-authored-by: Rebecca Dimock <66339736+beckykd@users.noreply.github.com>

docs/support.mdx

@@ -100,4 +100,12 @@ instructions included with Qiskit Aer.
   </summary>
 
 The simulator models an ideal environment, without noise or decoherence. When jobs are run on the real devices, noise from the environment and decoherence cause the qubits to behave differently than in an ideal environment.
+</details>
+
+<details>
+  <summary>
+    How do I delete my account and data?
+  </summary>
+
+To delete your account, go to your [account page](https://quantum.ibm.com/account#delete-account). Scroll to the Delete Account section, and click *Delete your account and account data*. You will receive an email with a link to delete your account.
 </details>