Remove CLI information from quickstart

[mintlify]

Summary

• Removed CLI tab from the "Make your first change" section
• Simplified to show only web editor workflow
• Updated "Explore CLI commands" card to "Install the CLI" with updated description

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Note

Low Risk
Documentation-only changes that remove CLI onboarding steps and adjust a link card; no runtime or security impact.

Overview
Simplifies quickstart.mdx by removing the CLI-based onboarding path and presenting a single web editor step-by-step workflow for making the first change.

Updates the “Next steps” CTA from “Explore CLI commands” to “Install the CLI” with revised copy that positions the CLI as an optional local development tool.

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