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)

tailwind.config.ts

@@ -11,7 +11,8 @@ const config: Config = {
         ink: '#0A1F44',        // texto principal
         cream: '#F5EBD0',      // texto sobre oscuro (marfil)
         gold: {
-          DEFAULT: '#B8901f',  // dorado tostado (sobre claro)
+          DEFAULT: '#B8901f',  // dorado tostado (sobre claro) — usar solo en texto grande/decorativo
+          deep: '#7A5F15',     // dorado profundo (AA 4.5:1 sobre claro para texto pequeño)
           bright: '#D4AF37',   // dorado (sobre oscuro)
         },
         muted: '#5a5168',