docs(code-style): commit messages should be in lowercase

[fellowseb]

Description

As I noticed in my first PR, the guidelines currently state that commit messages need to start with a capital letter. This guideline is not followed so let's change it. I went with @avivkeller 's recommendation, the convention most repos follow: only lowercase except for proper nouns.

Validation

N/A

Related Issues

N/A

Check List

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run pnpm format to ensure the code follows the style guide.
• [ ] I have run pnpm test to check if all tests are passing.
• [ ] I have run pnpm build to check if the website builds without errors.
• [ ] I've covered new added functionality with unit tests if necessary.