refactor: Migrate to monorepo

BREAKING CHANGE: Complete structure overhaul

services/docs/themes/hextra/layouts/_markup/render-heading.html

@@ -0,0 +1,8 @@
+<h{{ .Level }}>
+  {{- .Text | safeHTML -}}
+  {{- if gt .Level 1 -}}
+    <span class="hx:absolute hx:-mt-20" id="{{ .Anchor | safeURL }}"></span>
+    <a href="#{{ .Anchor | safeURL }}" class="subheading-anchor" aria-label="Permalink for this section"></a>
+  {{- end -}}
+</h{{ .Level }}>
+{{- /* Drop trailing newlines */ -}}