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/_default/contact.html

@@ -0,0 +1,55 @@
+{{ define "main" }}
+<h1>Get in touch</h1>
+<p style="opacity:0.85;">Tell me a bit about what you're working on — I read every message myself.</p>
+
+<form id="contact-form" style="margin-top:2rem;">
+  <label for="name">Name</label>
+  <input type="text" id="name" name="name" required autocomplete="name">
+
+  <label for="email">Email</label>
+  <input type="email" id="email" name="email" required autocomplete="email">
+
+  <label for="message">Message</label>
+  <textarea id="message" name="message" rows="6" required></textarea>
+
+  <div class="field-honeypot" aria-hidden="true">
+    <label for="website">Leave this field empty</label>
+    <input type="text" id="website" name="website" tabindex="-1" autocomplete="off">
+  </div>
+
+  <button type="submit" class="btn">Send message</button>
+  <p id="contact-status" role="status" style="margin-top:1rem;"></p>
+</form>
+
+<script>
+  (function () {
+    var form = document.getElementById("contact-form");
+    var status = document.getElementById("contact-status");
+    form.addEventListener("submit", function (e) {
+      e.preventDefault();
+      var payload = {
+        name: form.name.value,
+        email: form.email.value,
+        message: form.message.value,
+        website: form.website.value
+      };
+      var submitBtn = form.querySelector("button[type=submit]");
+      submitBtn.disabled = true;
+      status.textContent = "Sending…";
+      fetch("{{ .Site.Params.eec_base_url }}/contact", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload)
+      }).then(function (res) {
+        if (!res.ok) throw new Error("request failed");
+        form.reset();
+        form.hidden = true;
+        status.textContent = "Thanks — I'll get back to you soon.";
+      }).catch(function () {
+        submitBtn.disabled = false;
+        status.textContent = "Something went wrong sending that. Try again, or email hello@reground.org directly.";
+      });
+    });
+  })();
+</script>
+{{ end }}