chore: Adapt sites to recent changes

sites/shared/components/json.js

@@ -0,0 +1,17 @@
+import React from 'react'
+import Highlight from 'shared/components/mdx/highlight.js'
+import hljs from 'highlight.js/lib/common'
+
+const Json = props => {
+  const code = props.js
+    ? JSON.stringify(props.js, null, 2)
+    : props.children
+
+  return <Highlight
+    language='json'
+    raw={hljs.highlight(code, { language: 'json' }).value}
+  />
+}
+
+export default Json
+