Clarify workflow creation steps and inline Slack install

[mintlify]

Summary

• Updated the workflow creation steps to reflect the new 4-step wizard (template selection, configuration, agent instructions, Slack notifications)
• Clarified that users can install the Slack app directly from the workflow creation or editing page without navigating away
• Added detail about the 10-channel limit for Slack notifications

Context: mintlify/mint@44392a4 — Configure Workflow Page Install Slack (#6538)

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Note

Low Risk
Low risk documentation-only updates that adjust dashboard workflow creation and Slack notification instructions; no code or runtime behavior changes.

Overview
Updates agent/workflows.mdx to match the current dashboard workflow creation flow, expanding the steps to cover naming/trigger configuration, agent instructions, and optional auto-merge.

Clarifies Slack notification setup by explicitly requiring the Mintlify Slack app and simplifying the in-flow install/enable steps for the Notify on completion toggle.

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