feat: Add styling and date

[novellac]

This PR starts styling the index and card pages.

Work done

• Starts styling the card page
• Add date to card page
• Remove boilerplate from index
• Add CoT's custom logo as favicon

Steps to test

1. Serve gridsome locally
2. Navigate to the index page (usually http://localhost:8080/)
   • See the new custom CoT content
3. Navigate to a card page, such as this one.
   • See the date at the top of the page
   • See layout with padding at breakpoints, as per figma.

Things I learned/Gotchas This really should have been multiple PRs, but I got carried away with the styling! 😊