feat: slim Footer strip with wordmark, tagline and legal line

lib/content.ts

@@ -88,3 +88,8 @@ export const cierre = {
 export const header = {
   cta: 'Hablemos',   // short nav CTA → #contacto (the full CTA lives in Hero/Cierre)
 };
+
+export const footer = {
+  tagline: 'tu estratega de crecimiento',
+  legal: '© 2026 creeer',
+};