Clarify currencies

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

content/_index.html

@@ -484,6 +484,7 @@ <h4 class="h3 my-0 fw-bold">Enterprise</h4>
               <li class="mb-3"><i class="bi bi-arrow-right-circle text-primary me-2"></i>Optional managed hosting</li>
             </ul>
             <p class="text-muted small mb-4">Available as an annual subscription, or as a perpetual license tied to a major version.</p>
+            <p class="text-muted small mb-4">We invoice in USD, EUR, or GBP.</p>
             <a href="mailto:hello@sourcemeta.com?subject=Enterprise%20Consultation%20Request" class="w-100 btn btn-lg btn-primary mt-auto">Contact Us</a>
           </div>
         </div>