Add Slack Assistant removal documentation

[yangleyland]

Added documentation for removing Slack Assistant installations from workspaces. The new section explains the removal process through the dashboard and clarifies what happens when an installation is removed (automatic app uninstallation, permanent data deletion, and irreversibility).

Files changed

• ai/slack-bot.mdx - Added "Remove the Slack app" section with step-by-step removal instructions and consequences

Generated from feat: add ability to remove slack assistant integration @rtbarnes

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Note

Adds clear removal guidance to Slack bot docs.

• New "Remove the Slack app" section in ai/slack-bot.mdx with step-by-step instructions via the dashboard
• Clarifies effects of removal: Slack app uninstalled, installation data permanently deleted, bot stops responding, action is irreversible

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