Update footer pro link

Author: jemgillam

src/components/SiteFooter.js

@@ -97,9 +97,9 @@ const SiteFooter = () => {
             <br />
             You can support the projects via{" "}
             <Link to="/sponsor/">sponsorship</Link>, by{" "}
-            <Link to="/postgraphile/pricing/">going Pro</Link>, or by paying for{" "}
-            <Link to="/support/">Professional Services</Link>. Your support is
-            gratefully received 🙏
+            <a href="https://postgraphile.org/pricing">going Pro</a>, or by
+            paying for <Link to="/support/">Professional Services</Link>. Your
+            support is gratefully received 🙏
             <br />
             <br />
             This site is copyright &copy; Benjie Gillam {currentYear}. Design