feat(404): add 404 page with i18n support

[ramistodev]

This pull request adds a localized custom 404 error page and improves translation consistency in the codebase. The main changes include implementing a new 404.astro page with i18n support, introducing new translation keys for the 404 page in both English and Spanish, and standardizing translation object keys for better maintainability.

404 Page Implementation:

• Added a new src/pages/404.astro component to render a user-friendly, localized 404 error page. The page displays translated titles, descriptions, and a "Back to home" button based on the user's locale.

Internationalization Enhancements:

• Introduced new translation keys (notFoundTitle, notFoundDescription, backToHome) for both English and Spanish in src/i18n/translations.ts to support the 404 page. [1] [2] [3]
• Standardized translation object keys by removing unnecessary quotes around keys (e.g., 'recursion' → recursion) for improved code consistency and maintainability in both English and Spanish translations. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Minor Code Improvements:

• Reformatted the getAlgorithmMetaTitle function signature for readability in src/i18n/translations.ts.

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