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/

requested review from @upsiflu

assigned to @upsiflu

added 1 commit

• aac5325a - adapt decap cms admin configuration to flat content path

Compare with previous version

added 5 commits

• aac5325a...d4cd5683 - 2 commits from branch main
• a873c2cf - rework content into flat structure
• abd7f994 - adapt decap cms admin configuration to flat content path
• 295aed05 - reboot

Compare with previous version

changed title from rework content into flat structure to rework content structure

changed the description

assigned to @yala and unassigned @upsiflu

removed review request for @upsiflu

mentioned in commit eb5f3ed2

merged