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)

site/layouts/_default/_markup/render-footnotes.html

@@ -1,13 +0,0 @@
-{{- /* render-footnotes.html
-     Replace Hugo's default <div class="footnotes"> with ASW-semantic markup.
-     Hugo v0.123.0+ render hook for the footnote block.
-     Ref: https://gohugo.io/render-hooks/footnotes/
-*/ -}}
-<footer data-role="footnotes">
-  <hr>
-  <ol>
-    {{- range .Items }}
-    <li id="{{ .ID }}">{{ .Content }}{{ .Return }}</li>
-    {{- end }}
-  </ol>
-</footer>