fix: amend broken link on fonts page

src/foundations/font.html

@@ -58,7 +58,7 @@ <h2>Guidelines for Co-op Headline</h2>
                             <li>in the Co-op blue colour</li>
                             <li>in white when used on a Co-op blue background</li>
                         </ul>
-                        <p><a href="/foundations/font-sizes.html">Go to information on the font sizes for Co-op Headline</a></p>
+                        <p><a href="/experience-library/foundations/font-sizes.html">Go to information on the font sizes for Co-op Headline</a></p>
                         <p><a href="https://app.brandcloudlines.com/co-op/login">Go to the brand website to download Co-op Headline</a> (login required)</p>
                         <p>This is what the Co-op Headline font looks like in upper and lowercase:</p>
                         <p class="coop-t-headline-upper coop-t-h-mega coop-u-brand">Co-op Headline</p>