PE-1032: dev-cookbook: Update README to include latest examples

[blshukla]

📝 Description

Update the examples/README.md file to include all recent example descriptions.

Issue: PE-1032

[Copilot]

Pull Request Overview

This PR updates the examples README.md file to include descriptions for all recent example additions, reorganizing the content structure for better clarity. The update transforms a basic list of examples into a comprehensive guide with detailed feature descriptions for each example.

Key changes:

• Reorganizes examples into logical categories (HTML & Web Storage, Node.js, Device & Plugin Integration)
• Adds detailed descriptions for 5 new examples (IndexedDB Caching, Local Storage, Bluetooth Scan, BS Self Updater, BS SQLite DB)
• Updates existing example descriptions with more comprehensive feature explanations

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[evan-morgan]

LGTM