Allow code blocks to import code from files or URLs

[Blargian]

Summary

Per request, code for code blocks should be able to be imported from files or URLs.

This change will allow the user to specify file= or url= on code snippets. For example:

file=code_snippets/ClickStack/config-unstructured-logs-with-processor.yaml
url=https://raw.githubusercontent.com/ClickHouse/clickhouse-connect/refs/heads/main/examples/pandas_examples.py

The code from the file or URL will be inserted as text into the code block in the markdown when yarn build is run. The changes show as diffs (i.e the markdown files are updated with the changes) so we can commit the latest change permanently for human or LLM readers of the markdown. The advantage of this is that we can test these snippets externally and pull them from other repositories.

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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Name	Status	Preview	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	Aug 6, 2025 7:24pm