docs: fix broken link and typo correction

[youyyytrok]

This PR fixes minor typographical errors in the README.md and CONTRIBUTING.md files.

• README.md: Corrected "repositiory" to "repository".
• CONTRIBUTING.md: Fixed broken redirect link to the Style Guide by updating the relative path to include the .md extension.

No new functionality has been added or removed. These changes improve documentation clarity and maintainability.

Related Issue(s)

N/A

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have run yarn format and yarn lint without getting any errors.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.