[WIP] Add CPS config docs

[marciw]

WIP CPS config

Not ready for review

begins to fix https://github.com/elastic/docs-content-internal/issues/30

Summary

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Tool(s) and model(s) used:
Cursor auto, Claude Opus 4.6
for pattern hunting, encouragement, syntax

[github-actions]

🔍 Preview links for changed docs

• deploy-manage/cross-project-search-config.md

[github-actions]

Vale Linting Results

Summary: 1 warning found

⚠️ Warnings (1)

File	Line	Rule	Message
deploy-manage/cross-project-search-config.md	184	Elastic.DontUse	Don't use 'just'.

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