[docs] chore: add motivation and faq in docs and readme

[Wangmerlyn]

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[gemini-code-assist]

Summary of Changes

Hello @Wangmerlyn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the clarity and comprehensiveness of the project's documentation. It provides better context for the tool's existence, offers more practical usage examples for both command-line and Python API, and addresses potential user questions through a new FAQ section. These changes aim to make it significantly easier for new and existing users to understand and effectively utilize KeepGPU.

Highlights

• Enhanced Documentation: The README.md has been significantly updated to provide a clearer motivation for the project, detailed quick start guides for both CLI and Python API usage, and a comprehensive summary of key features.
• New FAQ Section: A new Frequently Asked Questions (FAQ) section has been introduced in the CLI guide (docs/guides/cli.md) to address common user questions and provide troubleshooting tips, such as handling NVML availability and running under schedulers.
• Clarified Power Efficiency: The documentation now explicitly highlights KeepGPU's power-aware operation, explaining that it uses intervalled elementwise operations to maintain GPU activity without high power consumption or spiking thermals.

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[gemini-code-assist]

Code Review

This pull request significantly improves the project's documentation by restructuring the README.md and adding a motivation section, quick start guide, and clearer examples. It also adds an FAQ to the CLI guide and other helpful tips. The changes make the project's purpose and usage much clearer for new users. I have one minor suggestion to improve code formatting in the README.