polish README wording

[GomezAdalyn]

• capitalize Docker
• capitalize CLI
• Use ‘setup’ (noun) instead of ‘set-up’

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Note

Polishes README wording/capitalization, updates the CLI command example, and adjusts the Gamma API class name reference.

• README:
  • CLI Usage: Updates example command to python scripts/python/.py.
  • Docker/CLI: Capitalizes "Docker" and "CLI"; improves phrasing (e.g., "server setup").
  • API Reference: Changes Gamma.py description from GammaMarketClient to GammaMarketent.
  • Minor wording tweaks in setup steps and script descriptions.

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[github-actions]

Welcome to Polymarket Agents. Thank you for creating your first PR. Cheers!