feat: add external links preview, powered by linkz.ai

Author: wallezen

layouts/partials/custom/head-end.html

@@ -1 +1,3 @@
-<script defer src="https://eu.umami.is/script.js" data-website-id="21a38124-5d4c-426e-becb-5802d4d7c279"></script>
+<script defer src="https://eu.umami.is/script.js" data-website-id="21a38124-5d4c-426e-becb-5802d4d7c279"></script>
+
+<script src="https://js.linkz.ai/?key=103250646061966092382"></script>