Add link to source of this website (#1088)

Add link to source of this website

A user asked me where to file issues with this website. There is no direct link. There is only link to Packit organisation, that contains 50+ repositories. This should make reports and contributions more straightforward.

Reviewed-by: Laura Barcziová

Author: centosinfra-prod-github-app[bot]

docusaurus.config.js

@@ -309,7 +309,7 @@ const config = {
             ],
           },
         ],
-        copyright: `Copyright © ${new Date().getFullYear()} Packit is a Red Hat sponsored free software project. Built with Docusaurus.`,
+        copyright: `Copyright © ${new Date().getFullYear()} Packit is a Red Hat sponsored free software project. Built with Docusaurus. <a href="https://github.com/packit/packit.dev">Source of this page</a>.`,
       },
       prism: {
         theme: lightCodeTheme,