Update CONTRIBUTING.md

[tylertitsworth]

Description

Some contributing documentation that I see online is too robotic and cold, and so I wanted to add some reassuring messages to help new contributors.

Related Issue

n/a

Changes Made

• Remove the bit about merge queues
• Update h1 doc description
• [ ] The code follows the project's coding standards.
• [ ] No Intel Internal IP is present within the changes.
• [ ] The documentation has been updated to reflect any changes in functionality.

Validation

n/a

• [ ] I have tested any changes in container groups locally with test_runner.py with all existing tests passing, and I have added new tests where applicable.

[github-actions[bot]]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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