Add Confluence connector docs and config example (MAIT-111)

[acikabubo]

Summary

• Add Confluence connector section to README with all 5 discovery modes and 3 auth strategies
• Add Confluence to the included connectors list
• Update config.yaml.example with all 4 connector mode blocks (space_key, page_ids, page_label, cql)
• Update .env.rag.example with CONFLUENCE1_* vars

Test plan

• Verified all config blocks match the connector implementation in rag-of-all-trades PR MAIT-174: Add Pipedrive connector config templates #29

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📥 Commits

Reviewing files that changed from the base of the PR and between 40f8bc4 and ac935b8.

📒 Files selected for processing (3)

• .env.rag.example
• README.md
• config.yaml.example

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