Update README

teste

docs: Add important note about --vcs-ref=main flag

docs: Add --vcs-ref=main flag to all copier commands

Move management back to core/ and cleanup test files

Move management to project root level to work around Copier bug

Remove _templates_suffix and exclude README.md

Test: Add non-jinja file to core

Test: Add nested test directory

Add .gitkeep to management folder

Add _templates_suffix to copier configuration

Rename files

Merge pull request #1 from rg3915/scaffold

docs: Add complete workflow examples with ninja_scaffold command

Fix: Create apps inside project directory (project_name/app_name)