reverts "chore(deps): bump loader-utils and @mdx-js/loader (#2884)" to have proper rendering of website again

[elkhart]

This reverts commit 1f54be2.

Noticed that the website is not rendering correctly anymore and saw the message
https://asyncapi.slack.com/archives/C34F2JV0U/p1713449085885509

Just reverted the related commit and tested it successfully locally with
npm run dev

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[asyncapi-bot]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	38
🟢 Accessibility	98
🟢 Best practices	92
🟢 SEO	100
🔴 PWA	33

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