- astro.config.mjs: section-only URLs now redirect to the first article in
that section. /whp/admin/ used to render Apache's directory listing
because no index.html existed; now it serves a meta-refresh to
/whp/admin/overview/. Same for /whp/, /whp/getting-started/,
/whp/how-to/, /whp/site-builder/, /whp/reference/, /whp/add-ons/.
- public/.htaccess: ships in dist, disables Options Indexes + MultiViews
(defense in depth so any future section without a redirect doesn't
leak a listing), and routes 404/403 to /404.html.
- src/content/docs/404.md: replaces the bare 'check the URL' tagline
with two explicit actions — 'Go to the knowledge base home' and
'WHP getting started'.
