Refine Enterprise Slack integration docs

[ak684]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

• Refines the Enterprise Slack integration page into a shorter operator guide that matches the style of the other Enterprise integration docs.
• Documents the Slack manifest flow, optional helper script flow, Replicated and Helm configuration, app install, user linking, channel setup, testing, and troubleshooting.
• Regenerates llms.txt and llms-full.txt.

Validation

• Ran Mintlify locally and confirmed /enterprise/integrations/slack returns 200.
• uv run --with pytest --with pyyaml pytest -q tests/test_sync_code_blocks.py tests/test_sync_use_case_automations.py
• python3 scripts/generate-llms-files.py

Full tests/ currently hits an unrelated upstream 404 in tests/test_pricing_documentation.py while fetching https://raw.githubusercontent.com/OpenHands/OpenHands/main/openhands/utils/llm.py.

[mintlify]

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Project	Status	Preview	Updated (UTC)
all-hands-ai	🟢 Ready	View Preview	Jun 8, 2026, 2:58 PM

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