Removed the themes from the core and added them to the odin-blog project.
Added composer check for the odin cli script. Added warning to README. Adjusted new theme path.
Moved default resources from odin to odin-blog, making odin less opinionated.
Removed outdated files from gitignore and moved skeletons to a place of their own.
Removed unused config items, renamed a few and adjusted config validation.