feat(connector): add Slack connector docs (MAIT-93)

[acikabubo]

Summary

• Move Slack from extra connectors to included connectors list in README
• Add Slack Connector section with config and env examples
• Add slack source example to config.yaml.example
• Add SLACK CONNECTORS section to .env.rag.example

Test plan

• Verify README Slack Connector section renders correctly
• Verify config.yaml.example Slack example is consistent with rag-of-all-trades implementation

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f966a285-d833-4af8-ba04-aaed95b95753

📥 Commits

Reviewing files that changed from the base of the PR and between b899e38 and 0fd7985.

📒 Files selected for processing (3)

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

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