Prohibited countries & territories (#12517)

Notifying people of countries we cannot do business with due to US
regulation. @alexmitchelliii

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [ ] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [ ] Documented any API changes (docs/Using-Fleet/REST-API.md or
docs/Contributing/API-for-contributors.md)
- [ ] Documented any permissions changes
- [ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [ ] Added support on fleet's osquery simulator `cmd/osquery-perf` for
new osquery data ingestion features.
- [ ] Added/updated tests
- [ ] Manual QA for all new/changed functionality
  - For Orbit and Fleet Desktop changes:
- [ ] Manual QA must be performed in the three main OSs, macOS, Windows
and Linux.
- [ ] Auto-update manual QA, from released version of component to new
version (see [tools/tuf/test](../tools/tuf/test/README.md)).

handbook/customers/README.md

@@ -66,9 +66,12 @@ This workflow outlines the process that sales and customer success can follow wh
     - Schedule the customer onboarding kickoff call
     - Collect deployment details (if not completed during POC)
     - Schedule the recurring customer check-in
-    - Owns running the meeting, note taking, TODO follow up, etc. 
+    - Owns running the meeting, note taking, TODO follow up, etc.
 
 
+> Due to legislation by the U.S. Department of Commerce, we are unable to initiate business with [certain countries and territories including specific U.S. sanction programs.](https://ofac.treasury.gov/sanctions-programs-and-country-information)
+
+ 
 ## Fleet's W-9
 
 A recent signed copy of Fleet's W-9 form can be found in [this confidential PDF in Google Drive](https://drive.google.com/file/d/1ugXazEBk1oVm_LqGbYNsIFECcv5jXLA9/view?usp=drivesdk).