add commit-msg-hook and edit style of scroll bar

[Xebec19]

This PR:

1. added commit-msg hook to check that commit messages contain at least one verb like "feat", "refactor" etc to highlight the purpose of the commit
2. edited style of the scroll bar

Self-Review Checklist

• PR title is clear with proper spelling and grammar
• PR description contains a bulleted list of changes contained in the PR
• PR links to relevant issues, with keywords to auto-close any issues fully resolved upon merge
• All automated checks passed
• Any variables introduced are named clearly and explicitly

commit-msg hook

every git commit message should contain one verb like "feat", "chore", "docs" etc and the message should be like "feat: some feature".
Please make sure that the hook is executable by

chmod +x .githooks/commit-msg

What happens when an invalid commit message is provided

scroll bar fix

before

after

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Name	Status	Preview	Updated
helpafamily	❌ Failed (Inspect)		Aug 15, 2022 at 4:14PM (UTC)