Rewrite landing to El component architecture

Full El component split: nav, hero, pillars, inference, pricing, footer, about,
enterprise, mission, viral, local_first, comparison, efficiency, environmental.

- About page rewritten first-person (Will's voice), photo included, no product spoilers
- Stripe checkout wired: env() reads STRIPE_SECRET_KEY/PRICE_* at startup
- Minor parent-onboarding callout added to pricing section
- Inference pricing: "at cost" removed, now "priced below competitors"
- Nav: wordmark image, About link active on /about
- .gitignore: excludes .env, dist/, generated HTML

src/footer.el

@@ -0,0 +1,36 @@
+// components/footer.el — Site footer.
+
+fn footer() -> String {
+    return "
+<footer id=\"footer\" aria-label=\"Footer\">
+  <div class=\"container\">
+    <div class=\"footer-inner\">
+
+      <a href=\"/\" class=\"footer-brand\" aria-label=\"Neuron home\">
+        <p class=\"footer-brand-name\">Neuron</p>
+        <p class=\"footer-brand-tagline\">Built Different.</p>
+      </a>
+
+      <div class=\"footer-center\">
+        <div class=\"navy-line\"></div>
+      </div>
+
+      <div class=\"footer-right\">
+        <p class=\"footer-domain\">neurontechnologies.ai</p>
+        <nav class=\"footer-nav\" aria-label=\"Footer navigation\">
+          <a href=\"/legal/terms\">Terms</a>
+          <a href=\"/legal/enterprise-terms\">Enterprise Agreement</a>
+          <a href=\"mailto:legal@neurontechnologies.ai\">Contact</a>
+        </nav>
+      </div>
+
+    </div>
+
+    <div class=\"footer-bottom\">
+      <p class=\"footer-copy\">&copy; 2026 Neuron Technologies. All rights reserved.</p>
+      <p class=\"footer-tagline-bottom\">Your memory. Your AI.</p>
+    </div>
+  </div>
+</footer>
+"
+}