clickhousectl docs

[sdairs]

Summary

Add docs for clickhousectl and references where relevant

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

[vercel]

You must have Developer access to commit code to ClickHouse on Vercel. If you contact an administrator and receive Developer access, commit again to see your changes.

Learn more: https://vercel.com/docs/accounts/team-members-and-roles/access-roles#team-level-roles

[dhtclk]

Will need to be updated to the appropriate number of steps when done. I see 9 methinks.

[dhtclk]

Suggested change

	The ClickHouse CLI (`clickhousectl`) is a unified command-line tool for managing ClickHouse Cloud resources, and local development with ClickHouse.
	The ClickHouse CLI (`clickhousectl`) is a unified command-line tool for managing ClickHouse Cloud resources and local development with ClickHouse.