fix html in search

[gingerwizard]

Summary

iframes and divs show in search drop down. We should probably remove all html from the markdown - ill follow up.

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx

[DamianMaslanka5]

@gingerwizard I think using something like Beautiful Soup to parse html might be easier to maintain and less error-prone than parsing markdown with regex.

[gingerwizard]

Yes aware. Was quick fix as I want to evaluate effect on relevancy of removing all html - hence comment. We measure changes in content and shift in ndcg vs user judged results