[site/home]: all deep dives featured on homepage

[khalilcodes]

Add all deep dive pages to Homepage featured section

based on comments from #137

This PR will add all the deep dive pages to the homepage featured list.

Tasks

• [x] set featured to true and add images for deep dive pages in content/notes/
• [x] Added new image logic to featured cards:
  • images for each deep dive page have not been added to public/images/ but using the youtube thumbnails instead.
  • if image is specified though that takes precedence over the thumbnail.
• [x] reusable function utils/getYoutube.js to get youtube image and id (used in Latest and MDX)

Tests

• [x] Latest.js component at /demo on homepage (Latest releases section)

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