fix(search): clean markdown elements in search contents

[Koooooo-7]

Summary

Import the markdown-to-txt library directly.

Before changes

Related issue, if any:

What kind of change does this PR introduce?

Bugfix

For any code change,

• [x] Related documentation has been updated, if needed
• [x] Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

Yes No

No

Tested in the following browsers:

• [x] Chrome
• [ ] Firefox
• [ ] Safari
• [ ] Edge

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 19, 2024 6:14pm

[jhildenbiddle]

Closing in favor of #2457.