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/__tests__/Cierre.test.tsx

@@ -16,4 +16,8 @@ describe('<Cierre />', () => {
     expect(mail.getAttribute('href')).toMatch(/^mailto:/);
     expect(li.getAttribute('href')).toMatch(/^https:\/\/(www\.)?linkedin\./);
   });
+  it('wraps contact links in a nav with aria-label="Contacto"', () => {
+    render(<Cierre />);
+    expect(screen.getByRole('navigation', { name: /contacto/i })).toBeInTheDocument();
+  });
 });

components/sections/__tests__/Disciplinas.test.tsx

@@ -9,4 +9,11 @@ describe('<Disciplinas />', () => {
     expect(screen.getByText('Digital')).toBeInTheDocument();
     expect(screen.getByText('Experiencias')).toBeInTheDocument();
   });
+  it('renders disciplines in a semantic list (ul/li) for a11y', () => {
+    const { container } = render(<Disciplinas />);
+    const list = container.querySelector('ul');
+    expect(list).not.toBeNull();
+    const items = list?.querySelectorAll('li');
+    expect(items?.length).toBe(3);
+  });
 });