Add mermaid diagram component parameters documentation

[mintlify]

Added documentation for the new actions and placement props for the mermaid diagram component. The actions prop controls interactive controls visibility, while placement positions controls in four corners.

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Created by Mintlify agent

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Note

Updates Mermaid docs to cover interactive control configuration and clarify default behavior.

• Adds Properties section documenting actions (show/hide controls) and placement (corner selection, default bottom-right) with ResponseField entries
• Provides example snippets for hiding controls, changing placement, and combining both
• Updates sample Mermaid code fences to include placement="top-right"
• Clarifies that controls appear by default when diagram height exceeds 120px

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[ethanpalm]

a few suggestions for concision/consistency but lgtm