Port homepage, posts section, shortcodes; update hugo.toml menus

- content/_index.md: homepage with site description and callout examples
- content/posts/asw-vocabulary.md: ASW data-* attribute vocabulary reference
- content/posts/getting-started.md: ASW-Hugo setup guide (updated URLs)
- hugo.toml: add params, taxonomies, menus (main + docs sidebar), ToC settings
- layouts/partials/nav.html: dynamic Hugo menu rendering (was hardcoded)
- layouts/shortcodes/callout.html, wikilink.html: ported from asw-hugo theme

Closes: asw#17, asw#13, asw#11, asw#16
28 pages build clean, deploy confirmed at port 8000.

hugo_stats.json

@@ -3,8 +3,10 @@
     "tags": [
       "a",
       "article",
+      "aside",
       "blockquote",
       "body",
+      "code",
       "dd",
       "div",
       "dl",
@@ -29,6 +31,7 @@
       "nav",
       "ol",
       "p",
+      "pre",
       "script",
       "section",
       "small",
@@ -47,23 +50,29 @@
     "classes": [
       "footnote-backref",
       "footnote-ref",
-      "footnotes"
+      "footnotes",
+      "highlight"
     ],
     "ids": [
       "a-taxonomy-of-agency",
+      "asw-data-attribute-vocabulary",
       "coda",
       "craft-as-methodology",
+      "example-full-page-skeleton",
       "fn:1",
       "fn:2",
       "fn:3",
       "fnref:1",
       "fnref:2",
       "fnref:3",
+      "getting-started-with-asw-hugo",
+      "installation",
       "principles-of-invisible-design",
       "the-dorveille-principle",
       "the-economics-of-attention",
       "the-table-of-hours",
-      "what-we-subtract"
+      "what-we-subtract",
+      "what-you-get"
     ]
   }
 }