Move to custom SSG instead of eleventy.

docs/renderer/nodes/Heading.njk

@@ -0,0 +1,29 @@
+{% set levelClasses = {
+  '1': 'text-5xl text-transparent bg-clip-text bg-gradient-to-b from-primary-400 to-primary-600 mb-12',
+  '2': 'text-4xl text-transparent bg-clip-text bg-gradient-to-b from-primary-400 to-primary-600 mb-12',
+  '3': 'text-lg md:text-2xl font-light'
+} %}
+
+{% set levelLinkClasses = {
+  '1': 'border-transparent hover:border-primary-600',
+  '2': 'border-transparent hover:border-primary-600',
+  '3': 'border-transparent hover:border-current'
+} %}
+
+{% macro render(node) %}
+  <h{{ node.level }}
+    id="{{ node.slug }}"
+    {% if levelClasses[node.level] %}
+      class="
+        {{ levelClasses[node.level] }}
+        {{ node.class }}
+      "
+    {% endif %}
+  >
+    {% if node.href %}
+      <a href="{{ node.href }}" class="border-b-2 {{ levelLinkClasses[node.level] }}">{{ node.text | safe }}</a>
+    {% else %}
+      <a href="#{{ node.slug }}">{{ node.text | safe }}</a>
+    {% endif %}
+  </h{{ node.level }}>
+{% endmacro %}