Disable unused taxonomy page kinds (closes #13)

Hugo enables the `tags` and `categories` taxonomies by default. This
site is a single page with no taxonomy terms and no taxonomy templates,
so every build emitted

    WARN  found no layout file for "html" for kind "taxonomy"

and generated `categories/index.xml` and `tags/index.xml` that nothing
links to. `disableKinds = ['taxonomy', 'term']` is the documented Hugo
mechanism for a site that uses no taxonomies; it removes the warning at
its source rather than suppressing it, and it does not create dead
template files to satisfy the layout lookup.

The premise was re-verified against hugo v0.164.0, the version now
pinned in `script/bootstrap`, rather than trusted from the issue text,
which was written when the build still used apk's 0.139.0. The warning
and the unwanted pages are unchanged on v0.164.0.

`make test`, `make lint` and `make check` now emit zero `WARN` lines, so
the build's noise floor is zero and the next warning to appear will be
visible instead of scrolling past. Rendered output is otherwise
byte-identical: `index.html`, `css/style.css` and the RSS `index.xml`
are unchanged, and `sitemap.xml` is still generated, now listing only
the home page rather than two taxonomy URLs.

hugo.toml

@@ -3,6 +3,14 @@ locale = 'en-us'
 title = 'LoRa Vegas — Las Vegas Meshtastic Community'
 theme = 'loravega'
 
+# This is a single-page site with no taxonomy terms and no taxonomy
+# templates. Hugo enables the `tags` and `categories` taxonomies by
+# default, so without this it generates taxonomy list pages it has no
+# layout for and warns on every build. The `sitemap` kind is left
+# enabled: sitemap.xml is still generated, and now lists only the home
+# page.
+disableKinds = ['taxonomy', 'term']
+
 [markup.goldmark.renderer]
   unsafe = true