Fix contributing URL

Author: leviarista

partials/footer.html

@@ -1,6 +1,6 @@
 <footer class="footer">
     <div class="links">
-        <a href="https://github.com/leviarista/github-profile-header-generator/issues" target="_blank"
+        <a href="https://github.com/leviarista/github-profile-header-generator?tab=contributing-ov-file#how-to-contribute" target="_blank"
             rel="noopener noreferrer">
             <b><u>Contributing</u></b>
         </a>