rework content structure
- adds content to README
- adds nested collections for Decap CMS
- adds Deno package caching for faster local development and CI builds
- updates index
- updates metadata
- refactors content into individual sections
- orders pages by using the date filed index files in subdirectories descending, named pages on the same level ascending
includes kudos to https://shellcongress.com/
Edited by jon r