Move the content graph layout into theme

content/graph.md

@@ -1,22 +1,9 @@
 ---
 title: "Content Graph"
+type: "graph"
 ---
-<script src="//unpkg.com/vis-network@9.1.0/dist/vis-network.min.js"></script>
-<script type="module" src="/graph/graph.js"></script>
-<style>
-#graph-container {
-    width: 100%;
-    height: 50vh;
-    border-radius: 0.2rem;
-    border: .075rem solid #bfbfbf
-}
-</style>
-<p>
-Here you can see a visualization of the posts on this blog using <a href="https://visjs.org/">Vis.js</a>.
+Here you can see a visualization of the posts on this blog using [Vis.js](https://visjs.org/).
 In the below graph, each node is an article, and each edge between nodes is a reference from
 one article to another. Each article is sized to be roughly proportional to its word count (file size
 is used as a quick metric for this purpose). You can hover over a node to see the title of the article
 it represents, and double-click to go to that article.
-</p>
-<div id="graph-container">
-</div>