Fixes to pages

[dvidsilva]

This pull request includes several updates to the codebase, primarily focusing on adding a new Subscribe component, improving type definitions, and enhancing SEO capabilities.

New Component Addition:

• src/components/Subscribe.tsx: Introduced a new Subscribe component that allows users to subscribe to a newsletter. It includes form handling and integration with the markketplace configuration for API calls.

Type Definitions and Usage:

• src/components/Header.astro: Added a new type activeNav and updated the Props interface to use this new type.
• src/pages/[slug].astro: Updated the import statement to include the new activeNav type and modified the Header component usage to use this type. (src/pages/[slug].astroL10-R10, src/pages/[slug].astroL32-R35)

Configuration Enhancements:

• src/config.ts: Added a colors object to the markketplace configuration to store primary and accent colors.

SEO Improvements:

• src/layouts/TagPosts.astro: Included the SEO object in the data transformation to ensure SEO metadata is available.

New Page Implementation:

• src/pages/newsletter.astro: Created a new newsletter page that uses the Subscribe component and includes layout and SEO configurations.This pull request includes changes to the src directory to improve type safety and consistency across components and pages. The most important changes include the introduction of a new type alias for activeNav, updates to the Header component, and enhancements to the TagPosts layout.

Type safety and consistency improvements:

• src/components/Header.astro: Introduced a new type alias activeNav for better type safety and replaced the inline type definition with this alias in the Props interface.
• src/pages/[slug].astro: Updated the import statement to include the new activeNav type alias from the Header component and used this alias when setting the activeNav prop for Header. (src/pages/[slug].astroL10-R10, src/pages/[slug].astroL32-R35)

Enhancements to TagPosts layout:

• src/layouts/TagPosts.astro: Added the SEO property to the data object being passed, ensuring that SEO metadata is included in the rendered output.