Add breadcrumb navigation and enhance button functionality

_includes/footer.html

@@ -9,4 +9,12 @@
     var sidenavElems = document.querySelectorAll('.sidenav');
     var sidenavInstances = M.Sidenav.init(sidenavElems, {});
   });
+
+  document.querySelectorAll("button").forEach(button => {
+    const href = button.getAttribute("data-href");
+    if (!href) return;
+    button.addEventListener("click", () => {
+        window.location.href = button.getAttribute("data-href");
+    });
+  });
 </script>