feat(infra): migración a tema Apollo, reestructuración del blog y página 'Sobre mí'

- Implementado tema Apollo como base visual.
- Segregación de contenido: Artículos movidos a /blog.
- Creación de identidad: Nueva página 'Sobre mí' (about.md).
- CI/CD: Actualizado workflow para soporte de submódulos recursivos.
- UX: Ajustes en homepage para listado de últimos posts.

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