Document new CLI flags for mint new command

[cdxker]

Enhanced the installation documentation to better document the new --theme, --name, and --force flags for the mint new command. Added examples for non-interactive/programmatic usage in CI/CD pipelines and with AI coding agents.

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Created by Mintlify agent

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Note

Enhances mint new documentation for clarity and automation use.

• Adds a Flags table detailing --name, --theme, and --force
• Introduces Non-interactive usage guidance (CI/CD and AI agents) requiring --name and --theme
• Provides updated command examples, including --force to overwrite without prompts
• Adds a Tip noting auto-detection of non-interactive environments and usage output when required flags are missing

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