Implement page bundles for content

[whoabuddy]

It allows group and resizing of images much easier than storing in the static directory, and should be more compatible with editing from Forestry as well.

https://gohugo.io/content-management/page-bundles/

Quick Steps:

• [x] add dir name matching files in content
• [x] move files into respective dirs
• [x] rename each file to index.md
• [ ] review adding any additional resources per article
  • cover images are the main target
  • also curious about resources e.g. a PDF

[whoabuddy]

This should also tie into forestry front matter, so that they could be added from the GUI later.