Replace textchunk & sanitize-html libs

[eheikes]

They don't seem to be maintained and have insecure deps.

• Fixes https://github.com/eheikes/tts/security/dependabot/103
• Fixes https://github.com/eheikes/tts/security/dependabot/102
• Fixes https://github.com/eheikes/tts/security/dependabot/96
• Fixes https://github.com/eheikes/tts/security/dependabot/95

[socket-security[bot]]

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

Package	New capabilities	Transitives	Size	Publisher
npm/sentence-splitter@5.0.0	None	+3	390 kB	azu

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