Functions: start generating string replacement functions

[Blargian]

Summary

Adds a new "String Replacement" function category to the autogeneration script and updates source/destination file arrays to include related markdown generation.

Adds category entry "String Replacement" to FUNCTION_CATEGORIES
Adds source file name string_replacement-functions.md
Adds destination path string-replace-functions.md (inconsistent with source/category naming)

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/integrations/index.mdx

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Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs	Ready	Preview	Comment	Oct 16, 2025 4:17pm
clickhouse-docs-jp	Building	Preview	Comment	Oct 16, 2025 4:17pm

2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs-ru	Ignored	Preview		Oct 16, 2025 4:17pm
clickhouse-docs-zh	Ignored	Preview		Oct 16, 2025 4:17pm

[Copilot]

Pull Request Overview

Adds a new "String Replacement" function category to the autogeneration script and updates source/destination file arrays to include related markdown generation.

• Adds category entry "String Replacement" to FUNCTION_CATEGORIES
• Adds source file name string_replacement-functions.md
• Adds destination path string-replace-functions.md (inconsistent with source/category naming)

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[Copilot]

Inconsistent naming between source (string_replacement) and destination (string-replace) plus mismatch between 'replacement' vs 'replace'. This likely breaks the expected index-based mapping or results in a missing destination file. Recommend standardizing to either 'string_replacement-functions.md' / 'string-replacement-functions.md' (matching existing pattern of underscore in source, hyphen in dest while keeping the same stem) or 'string_replace-functions.md' / 'string-replace-functions.md', but keep the stem identical in both arrays.

Suggested change

	"string_replacement-functions.md"
	"string_replace-functions.md"

[Copilot]

Inconsistent naming between source (string_replacement) and destination (string-replace) plus mismatch between 'replacement' vs 'replace'. This likely breaks the expected index-based mapping or results in a missing destination file. Recommend standardizing to either 'string_replacement-functions.md' / 'string-replacement-functions.md' (matching existing pattern of underscore in source, hyphen in dest while keeping the same stem) or 'string_replace-functions.md' / 'string-replace-functions.md', but keep the stem identical in both arrays.