Create or find a `pre-commit` hook

# 💡 Summary #

Create or find a `pre-commit` hook that fails if running the script from #196 actually changes anything.

## Motivation and context ##

This would force users to update the Terraform documentation whenever necessary.

## Implementation notes ##

Requires #196 as a prerequisite.

Start by reviewing issue #196 and the repository's existing hook configuration, since this issue depends on that script. Verify that the pre-commit hook detects changes made by the script and fails when Terraform documentation is modified; done means the hook enforces that check.

Written by the indexing model from the issue text.