[site/seo]: page speed optimization, keywords and sitemap for seo

[khalilcodes]

Keywords field, page speed optimizations and components refactoring for better page performance and SEO

164

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This PR brings the following changes:

SEO meta fields have been added so that google crawls for specific words. Page speeds have been improved by replacing iframe embed components.

Tasks:

• [x] keywords field added in frontmatter
  • keywords are used in meta keywords and also meta article tags
• [x] Youtube embed has been replaced with a different component using this library - react-youtube-lite-embed
• [x] replacing import for components with next/dynamic imports for faster page builds and performance (code-splittng)
• [x] Podcasts iframe has been replaced with a link instead for faster page loads.
• [x] Using next/image in homepage feautred section for page performance. (reverted as not supported in netlify)
• [x] Script added to postbuild to generate sitemaps.
• [x] clean up package.json removing unused packages and structure accordingly to dev dependencies.

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