docs: fix links

[antonkri97]

Hey everyone!

This pull request only about doc links.

1. I removed incorrect links leading to non-existent resources
2. I removed block about tech explanation since I did not find tech explanation in main branch
3. I set proper links to existent resources

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9f0abb6

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[remix-cla-bot]

Hi @antonkri97,

Welcome, and thank you for contributing to Remix!

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- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[MichaelDeBoey]

Thanks for opening this PR! 🙏

However, I'm going to close this as this is already fixed by #7191