fix: font-size changing for code in headings

[Yash-Singh1]

Summary

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• Bugfix
• Feature
• Code style update
• Refactor
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[Yash-Singh1]

Before:

After:

[trusktr]

Thanks @Yash-Singh1! This bugged me before too, and I put custom style on my site.

@docsifyjs/reviewers should this sort of change be saved for v5? It is an ideal change, but does have some chance (even if small) to break someone's v4 site.

[anikethsaha]

I agree, it may break snapshot testing as far as I can think.
But I think its worth adding now as we really dont know how long it will take to land v5.
This looks more like a bug so I guess we can add this.

let me know if I am missing anything

[sy-records]

I think it can be released from v4.12.0

[jhildenbiddle]

LGTM