Refactored a Post data type out of my prototype post

On https://notmagic.tech, I refactored the first post to be generated from a Post datatype comprising all data in the post, rather than just being a giant hard-coded file

This is going to allow me to do a few things

- Create a Post card that I can show across the site
- Homepage
- Similar posts
- A post page that shows all of the posts that have been published
- Refactor a Post shell that allows all posts to look uniform
- Create a dynamic route for posts