docs: update Code of Conduct link in README

Ahmed Anwarrequested to merge
ahmedanwar1/cli:docs/update-code-of-conduct-link into main

Description

Updates the Code of Conduct link in README.md to point to https://about.gitlab.com/community/contribute/code-of-conduct/ instead of the moved file path.

Related Issues

N/A

Edited by Ahmed Anwar

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