Move YAML indentation issue hint into different layer

[nathanjmcdougall]

Motivation

usethis-python/src/usethis/_interface/ci.py

Lines 26 to 31 in bb97936

	except UsethisError as err:
	err_print(err)
	if "mapping values are not allowed here" in str(err):
	info_print("Hint: You may have incorrect indentation the YAML file.")
	raise typer.Exit(code=1)

This doesn't seem like the right place for this hint. I think it should live at a lower level - in the YAML layer. Then it can propogate to all cases of improperly configured YAML files, not just this one case.

Summary of desired enhancement
Move this logic into the YAML integration layer.