Add MP Digital homepage with hero SVG, GSAP animations and responsive styles

[Dannyytta]

Motivation

• Provide a full landing page for MP Digital with a branded hero, clear product and supplier sections, and responsive navigation.
• Introduce subtle motion to the hero to improve perceived polish and guide attention using GSAP.

Description

• Add gsap to package.json and include a new hero illustration at public/hero-corporate.svg.
• Replace src/pages/index.astro with a complete Spanish landing page including content arrays (supplierPoints, productCards, storyBullets) rendered via map, accessible navigation, and CTA links.
• Embed client-side behavior that runs a GSAP timeline for the hero (runHeroAnimation) and implements a keyboard- and click-aware nav toggle with ARIA attributes.
• Add comprehensive responsive CSS and layout rules in the same file to style header, hero, supplier/product/story sections and mobile behaviors.

Testing

• Ran npm install and npm run build (the Astro build) and the build completed without errors.
• No automated unit tests were present; visual/manual verification performed during the build succeeded.

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Codex Task