WIP: Add alex as a Danger file

What does this MR do?

Adds a new step in Danger to warn on non-inclusive and profane language.

This works for commits:

And for documentation:

What are the relevant issue numbers?

Part of diversity-inclusion#3 (moved)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer