[FSSDK-11466] README update

[mikechu-optimizely]

This pull request updates the README.md to improve onboarding and usability for the Optimizely Cloudflare Worker Starter Kit. The changes focus on making setup instructions clearer, adding a quick start guide, revising prerequisites, and providing a new troubleshooting section to help users resolve common issues.

Onboarding improvements:

• Added a "Quick Start" section with step-by-step instructions for cloning the template, installing dependencies, configuring the SDK key, and starting the local development server.
• Updated and clarified the "Prerequisites" section to specify Node.js and npm requirements, detail account setup, and provide clear instructions for installing the Wrangler CLI.

Configuration guidance:

• Revised installation and configuration steps to use git clone for template setup, improved instructions for setting the Optimizely SDK key, and added explicit guidance for configuring the Cloudflare account ID in wrangler.jsonc. [1] [2]

Troubleshooting support:

• Added a comprehensive "Troubleshooting" section with solutions for common setup and deployment errors, including SDK key issues, datafile fetch errors, account ID problems, local dev server issues, and feature flag debugging.

Minor documentation cleanups:

• Removed unnecessary blank lines and improved formatting in the "Other Optimizely SDKs" section.

FSSDK-11466

[Copilot]

Pull Request Overview

This pull request updates the README.md to significantly improve the onboarding experience for the Optimizely Cloudflare Worker Starter Kit. The changes focus on making setup instructions clearer and more accessible for new users.

• Added a Quick Start section with step-by-step commands for immediate setup
• Enhanced Prerequisites section with specific version requirements and clearer installation instructions
• Added comprehensive Troubleshooting section to help users resolve common setup and deployment issues

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