docs: new validate AsyncAPI files tutorial

[Annysah]

Description

• NEW tutorial, "How to Validate AsyncAPI files"

Related issue(s) Fixes #872

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[Annysah]

Hey @derberg , @alequetzalli confirmed to me that this PR is ready for technical review. I would love your review. Thank you!

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⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	40
🟠 Accessibility	88
🟠 Best practices	83
🟢 SEO	90
🔴 PWA	30

Lighthouse ran on https://deploy-preview-971--asyncapi-website.netlify.app/

[quetzalliwrites]

perfect, now the order is correct 👍🏽

[quetzalliwrites]

I'll provide my detailed review after we get @derberg's technical review done ✌🏽

[Annysah]

Thank you so much for all the feedbacks, I will implement them!

[quetzalliwrites]

I think this PR is now no longer valid since we're deleting the streetlights tutorial and refactoring into 4 new mini-tutorials.

I will close it later this week unless @derberg / @Annysah inform me otherwise. ✌🏽

[derberg]

@alequetzalli wasn't this supposed to be converted into a guide?

[quetzalliwrites]

@derberg It was, but she got confused an opened a NEW PR with the guide content.

Closing this PR which as stated above, is no longer relevant :)