Improves README flow

[JyotinderSingh]

Improves the structure and overall flow of the documentation to make it easier for new users to onboard

[gemini-code-assist]

Summary of Changes

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This pull request significantly improves the README.md documentation to enhance the user onboarding experience and overall clarity. The changes focus on reorganizing content for better flow, adding detailed explanations for core functionalities, and providing comprehensive guides for setup, usage, and advanced configurations.

Highlights

• Documentation Structure: The README.md has been significantly restructured to improve the flow and readability for new users, making it easier to navigate and understand the project.
• New 'How It Works' Section: A dedicated 'How It Works' section was added to provide an immediate, high-level overview of the Keras Remote execution pipeline.
• Enhanced Features Description: The 'Features' section was expanded to include new capabilities such as fast iteration via container caching, a declarative Data API, and environment variable forwarding.
• Streamlined Onboarding Experience: The 'Installation' and 'Quick Start' sections were consolidated into a more comprehensive 'Getting Started' guide, detailing prerequisites, installation, and infrastructure provisioning steps.
• Detailed Usage Guide: The 'Usage Examples' section was renamed to 'Usage Guide' and now includes advanced topics like custom dependencies, prebuilt container images, environment variable forwarding, multi-host TPU, and multiple cluster management.
• Updated Reference Information: 'Configuration' and 'Supported Accelerators' were moved under a new 'Reference' section, and the accelerator lists were updated with more comprehensive TPU and GPU configurations.
• Dedicated CLI Commands Section: A new section for keras-remote CLI commands was introduced, detailing operations such as up, down, status, config, and pool for managing cloud resources.

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Changelog

• README.md
  • Reorganized the Table of Contents to reflect the new structure.
  • Added a new 'How It Works' section to explain the remote execution pipeline.
  • Expanded the 'Features' list with new items like 'Fast iteration', 'Data API', and 'Environment variable forwarding'.
  • Restructured 'Installation' and 'Quick Start' into a consolidated 'Getting Started' section, including prerequisites, installation, and infrastructure provisioning.
  • Renamed 'Usage Examples' to 'Usage Guide' and moved 'Custom Dependencies' and 'Prebuilt Container Images' under it.
  • Added new sub-sections under 'Usage Guide' for 'Forwarding Environment Variables', 'Multi-Host TPU (Pathways)', and 'Multiple Clusters'.
  • Updated and expanded the 'Supported Accelerators' tables for TPUs and GPUs with more configurations.
  • Introduced a dedicated 'CLI Commands' section detailing keras-remote operations.
  • Consolidated configuration details under a new 'Reference' section.
  • Removed the top-level 'Resource Cleanup' section, integrating its information into relevant new sections like 'Getting Started' and 'CLI Commands'.

Activity

• No human activity (comments, reviews) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request significantly improves the structure and clarity of the README.md file, making it much easier for new users to get started. The documentation is now better organized with a logical flow, from 'How It Works' and 'Getting Started' to a comprehensive 'Reference' section for more advanced topics. I've added a couple of suggestions to resolve a minor inconsistency in documented startup times and to improve internal navigation, but overall this is an excellent update to the documentation.

_{Note: Security Review has been skipped due to the limited scope of the PR.}