Add attribute property to scripts from jsdelivr

Adding the integrity attribute protects the website (by refusing to load
the script) against malicious modifications of the script
in the case of jsdelivr gets hacked

layouts/partials/graph.html

@@ -1,4 +1,4 @@
-<script src="https://cdn.jsdelivr.net/npm/d3@6"></script>
+<script src="https://cdn.jsdelivr.net/npm/d3@6.7.0/dist/d3.min.js" integrity="sha256-+7jaYCp29O1JusNWHaYtgUn6EhuP0VaFuswhNV06MyI=" crossorigin="anonymous"></script>
 <h3>Interactive Graph</h3>
 <div id="graph-container"></div>
 <style>