(docs): document how to register typescript paths

[erwinheitzman]

Proposed changes

Document how to register typescript paths

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Reviewers: @webdriverio/project-committers

[christian-bromann]

I remember that I removed the whole tsconfig-path configuration (see 709b5da) because it wouldn't support ESM (see dividab/tsconfig-paths#243). Can you confirm that it actually works?

[erwinheitzman]

Sadly I think it was some cache or something because when I ran it, it passed and later on I couldn't get it to work again, no matter what I tried :(