Add i18n Support (English and Spanish)

[jcorona48]

Description:
Implement internationalization (i18n) to support multiple languages, starting with English and Spanish.

Tasks:

1. Configure an i18n library (e.g., [astro-i18next](https://github.com/yassinedoghri/astro-i18next) or similar).
2. Create language files for English (en.json) and Spanish (es.json).
3. Refactor components to load text dynamically based on the selected language.
4. Add a language switcher to toggle between English and Spanish.
5. Ensure the site’s metadata (e.g., <title>, <meta> tags) is localized.

Acceptance Criteria:

• The user can switch between English and Spanish.
• All text and relevant metadata are translated.
• The language setting persists across pages.

[jcorona48]

Closed #5