fix: a11y (gold-deep token AA, Disciplinas ul/li, Cierre nav) + scaffold cleanup

- Add gold-deep #7A5F15 token (~5.97:1 on white, WCAG AA) for small-text eyebrows
- Apply text-gold-deep to 4 eyebrows (Hero, Disciplinas, ComoEmpezar, Estratega)
- Disciplinas: div grid → semantic ul/li for screen-reader consistency
- Cierre: wrap contact links in <nav aria-label="Contacto">
- Estratega: portrait gradient → Tailwind tokens (from-ink to-gold), drop inline hex
- Delete unused Geist fonts (app/fonts/, ~134KB)
- Replace default README with creeer README
- Tests: +2 structural (Disciplinas ul/li, Cierre nav aria-label)

components/sections/Cierre.tsx

@@ -22,13 +22,15 @@ export function Cierre() {
           <motion.div variants={fadeInUp} className="mt-10">
             <CTA href={whatsapp.href} label={cierre.cta} variant="dark" />
           </motion.div>
-          <motion.ul variants={fadeInUp} className="mt-12 flex flex-wrap justify-center gap-6 text-sm">
-            <li><a href={whatsapp.href} className="hover:text-gold-bright transition-colors">{whatsapp.label}</a></li>
-            <li aria-hidden="true" className="text-muted-dark">·</li>
-            <li><a href={email.href} className="hover:text-gold-bright transition-colors">{email.label}</a></li>
-            <li aria-hidden="true" className="text-muted-dark">·</li>
-            <li><a href={linkedin.href} className="hover:text-gold-bright transition-colors">{linkedin.label}</a></li>
-          </motion.ul>
+          <motion.nav variants={fadeInUp} aria-label="Contacto" className="mt-12">
+            <ul className="flex flex-wrap justify-center gap-6 text-sm">
+              <li><a href={whatsapp.href} className="hover:text-gold-bright transition-colors">{whatsapp.label}</a></li>
+              <li aria-hidden="true" className="text-muted-dark">·</li>
+              <li><a href={email.href} className="hover:text-gold-bright transition-colors">{email.label}</a></li>
+              <li aria-hidden="true" className="text-muted-dark">·</li>
+              <li><a href={linkedin.href} className="hover:text-gold-bright transition-colors">{linkedin.label}</a></li>
+            </ul>
+          </motion.nav>
         </motion.div>
       </Container>
     </section>