Describe the bug
When I (use a container image to) run megalinter locally, I want it to not create reports. Unfortunately, setting REPORT_OUTPUT_FOLDER to none doesn't help as documented, instead it makes megalinter create a folder named "none".

To Reproduce
Steps to reproduce the behavior:

1. Create a configuration file .mega-linter.yml.
2. Add REPORT_OUTPUT_FOLDER: none as a configuration setting in that file.
3. Run megalinter (e.g. via a container image as below).
4. A folder named "none" is created, which contains the megalinter reports.

docker run --rm -v $PWD:$PWD -e DEFAULT_WORKSPACE=$PWD oxsecurity/megalinter-documentation:v6

Expected behavior
No folder is created. No reports are written to the file system.

Additional context
Related: Is there a typo in the documentation of REPORT_OUTPUT_FOLDER or what does that sentence mean?

- Send `none` to not generate reports
+ Set to `none` to not generate reports