Slack integration guide update

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Summary

This update revises the Slack integration documentation, focusing on the new Slack App for alerts and providing guidance for migrating from the deprecated Slack webhook method. It also clarifies configuration steps and details the permissions required by the Checkly Slack App.

Changes

• Updated instructions for setting up Slack as an alerting channel using the Checkly Slack App.
• Added a new section on migrating from deprecated Slack webhook alert channels.
• Included a table detailing the permissions requested by the Checkly Slack App.
• Revised the example alert images to reflect the new Slack App format.
• Removed mentions of AI in the root cause analysis note.

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