Use case

A team uses a CI system and would like to ensure documentation quality never regresses.
To this end, the CI job has a step that runs mkdocs build --strict which reports a failure if building the documentation results in any warnings or errors.

However, it can still happen that someone will write new documentation but forget to include it in the nav configuration. And MkDocs will detect this and report it. Here is an example output:

INFO    -  The following pages exist in the docs directory, but are not included in the "nav" configuration:
  - README.md
  - foo.md

Feature request

Would it be possible to configure this INFO message to be a WARNING?

As a bonus, would it be possible to configure which files in the docs directory should be ignored by MkDocs completely?