Exclude README from pre-commit globally

[justusschock]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Globally exclude README from all pre-commit hooks and not hook-by-hook

Before:

pre-commit run --all-files
fix end of files.........................................................Failed
- hook id: end-of-file-fixer
- exit code: 1
- files were modified by this hook

Fixing README.md

trim trailing whitespace.................................................Passed
check for case conflicts.................................................Passed
check yaml...............................................................Passed
check toml...............................................................Passed
check json...........................................(no files to check)Skipped
check for added large files..............................................Passed
check docstring is first.................................................Passed
detect private key.......................................................Passed
type annotations not comments............................................Passed
codespell................................................................Passed
prettier.................................................................Passed
ruff (legacy alias)......................................................Passed
ruff format..............................................................Passed
ruff (legacy alias)......................................................Passed

After:

⚡ exclude-readme-from-precommit ~/litAI pre-commit run --all-files             
fix end of files.........................................................Passed
trim trailing whitespace.................................................Passed
check for case conflicts.................................................Passed
check yaml...............................................................Passed
check toml...............................................................Passed
check json...........................................(no files to check)Skipped
check for added large files..............................................Passed
check docstring is first.................................................Passed
detect private key.......................................................Passed
type annotations not comments............................................Passed
codespell................................................................Passed
prettier.................................................................Passed
ruff (legacy alias)......................................................Passed
ruff format..............................................................Passed
ruff (legacy alias)......................................................Passed

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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