Rename .prettierrc.js to .prettierrc.cjs when "type": "module" is set #79
Description
When installing eslint-config-cecilia in a project with "type": "module" defined in package.json, the .prettierrc.js file will fail to load due to module type mismatch.
This happens because Prettier expects the config to be in CommonJS format, but .js files are treated as ESM in such projects.
Suggested fix:
During install, if "type": "module" is detected, create .prettierrc.cjs instead of .js
This would improve compatibility with modern ESM-based projects