Add nav/footer, contact form, privacy/terms drafts, first course landing page

- baseof.html: proper header/nav/footer, CSS custom properties for
  light/dark, button and form component styles — no external theme
  dependency, avoiding the submodule/version churn from the earlier
  PaperMod attempt.
- Contact page: real form (honeypot spam protection) posting to the eec
  service's new /contact endpoint, replacing the plain mailto CTA.
- Privacy Policy and Terms drafts — grounded in what's actually true here
  (self-hosted mail/course infra, no third-party trackers), flagged as
  drafts pending review.
- courses/ section with a generic single template driven by front matter
  (eec_slug, pitch) and the first course, Find Your Right Readers —
  landing page only; the actual course content isn't authored in
  eec-courses yet, so enrolling will 404 until that's written.
- Fixed hugo.toml baseURL (was www.reground.org, but Caddy's canonical
  host is the bare domain — www redirects to it, not the other way).

layouts/index.html

@@ -4,7 +4,7 @@
 <div style="margin-top:2rem;">{{ .Params.intro | markdownify }}</div>
 {{ with .Params.cta_text }}
 <p style="margin-top:2rem;">
-  <a href="{{ $.Params.cta_link }}" style="display:inline-block; padding:0.75rem 1.5rem; border-radius:0.4rem; background:#1a5fb4; color:#fff; text-decoration:none;">{{ . }}</a>
+  <a class="btn" href="{{ $.Params.cta_link }}">{{ . }}</a>
 </p>
 {{ end }}
 {{ end }}