asw-v01: archive deferred content (packs, site, lab, legacy examples)

- 2.1: packs/ -> archive/packs/
- 2.2: site/ -> archive/site/
- 2.3: src/lab/ -> archive/lab/
- 2.4: examples/ -> archive/examples-legacy/ (SSI-based)

archive/site/layouts/notes/single.html

@@ -0,0 +1,39 @@
+{{ define "content" }}
+  <section data-layout="docs">
+
+    <nav aria-label="Notes" data-nav="sidebar">
+      {{- with .CurrentSection -}}
+      <h3>{{ .Title }}</h3>
+      <ul>
+        {{- range .RegularPages.ByWeight -}}
+        <li>
+          <a href="{{ .RelPermalink }}"
+            {{- if eq .RelPermalink $.RelPermalink }} aria-current="page"{{ end -}}>
+            {{- .LinkTitle -}}
+          </a>
+        </li>
+        {{- end -}}
+      </ul>
+      {{- end -}}
+    </nav>
+
+    <article>
+      <header>
+        <h1>{{ .Title }}</h1>
+        {{- with .Description }}
+        <p>{{ . }}</p>
+        {{- end }}
+      </header>
+
+      {{ .Content }}
+    </article>
+
+    {{- with .TableOfContents -}}
+    <aside data-toc>
+      <h3>{{ i18n "onThisPage" | default "On this page" }}</h3>
+      {{ . }}
+    </aside>
+    {{- end -}}
+
+  </section>
+{{ end }}