Add editor structure outline to the developer guide on the website

website/templates/macros/replacements.html

@@ -38,3 +38,18 @@
 {{ load_data(path="static/text-balancer.js", format="plain") | safe }}
 </script>
 {% endmacro text_balancer %}
+
+{% macro hierarchical_message_system_tree() %}
+{%- set content = load_data(path = "other/editor-structure/replacement.html", format = "plain", required = false) -%}
+{%- set fallback = "<pre>THIS CONTENT IS FILLED IN WHEN CI BUILDS THE WEBSITE.
+
+TO TEST IT LOCALLY, RUN:
+
+cd website/other/editor-structure
+
+AND THEN:
+
+cargo test --package graphite-editor --lib -- messages::message::test::generate_message_tree
+node generate.js ../../../hierarchical_message_system_tree.txt replacement.html</pre>" -%}
+{{ content | default(value = fallback) | safe }}
+{% endmacro hierarchical_message_system_tree %}