Adding documentation

miyagi supports multiple ways of documentation:

1. You can create documentation files in your components to document their behavior.
2. You can put markdown files anywhere inside your config.components.folder directory. If you name them either README.md, index.md or <directory>.md (i.e. the file name equals the directory name), this file will be used as the index for the current directory.
3. The config.docs.folder directory can be used as a dedicated directory for documentation. It would be shown on the same level as your components directory in the menu. If you do not use it, you can set config.docs.folder to null.