fix: improved styling for annoucement hero

[vishvamsinh28]

This pull request improves the styling of annoucement banner for smaller devices

Before :-

After :-

Fixes #1920

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	44
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🔴 PWA	30

Lighthouse ran on https://deploy-preview-1921--asyncapi-website.netlify.app/

[derberg]

please next time also specify link to the page where you saw an issue.

first I was checking landing page and was confused as there was no error, took me some time to figure from the screen shots.

thanks for the fix!

[derberg]

/rtm