add SRI hash for vis.js
{% block preamble %}
{# This line loads the vis.js library for custom model extension to use #}
- <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.16.1/vis.min.js"></script>
+ <script
+ type="text/javascript"
+ src="https://unpkg.com/vis-graph3d@6.0.2/dist/vis-graph3d.min.js"
+ integrity="sha384-/w3emp/TDpiU/NL7tl+GT9ZZC1zCikTdVYa0Kit58LbrtTqNpLrZ5MaoOi7pR0UA"
+ crossorigin="anonymous"
+ ></script>
<style>
h1 {
