fix: improve block html perf

[quantizor]

Closes #546

Thank you @devbrains-com for contributing the basis of this fix!

[changeset-bot]

🦋 Changeset detected

Latest commit: 04a07ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
markdown-to-jsx	Patch

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[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@jridgewell/source-map@0.3.6	None	0	177 kB	jridgewell
npm/escalade@3.1.2	filesystem	0	11.6 kB	lukeed
npm/is-number@7.0.0	None	0	9.62 kB	jonschlinkert
npm/punycode@2.3.1	None	0	33.5 kB	google-wombot

🚮 Removed packages: npm/define-data-property@1.1.4, npm/es-define-property@1.0.0, npm/has-property-descriptors@1.0.2, npm/internal-slot@1.0.7, npm/object-keys@1.1.1, npm/prettier@3.2.5, npm/regexp.prototype.flags@1.5.2, npm/set-function-length@1.2.2, npm/set-function-name@2.0.2, npm/side-channel@1.0.6

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