docs: add Key Features section to scheduler documentation

[aaradhychinche-alt]

Summary

This PR adds an initial Key Features section to the Volcano documentation to provide a high-level overview of the scheduler’s core capabilities.

Changes

• Added a new Key Features section under the Scheduler documentation
• Introduced an overview of major Volcano features, including:
  • Unified scheduling on Kubernetes
  • Gang scheduling
  • Hierarchical queues
  • Colocation of online and offline workloads
  • Extensible scheduling plugins

Motivation

The current documentation lacks a centralized entry point that explains Volcano’s main features. This change establishes a foundation for adding more detailed feature guides in follow-up PRs.

Refs #330

[volcano-sh-bot]

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[gemini-code-assist]

Summary of Changes

Hello @aaradhychinche-alt, 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 addresses a gap in the Volcano documentation by introducing a new "Key Features" section. Its purpose is to provide a centralized, high-level overview of the scheduler's fundamental capabilities, making it easier for users to grasp Volcano's value proposition. This addition serves as a foundational piece for future, more detailed feature guides.

Highlights

• New Documentation Section: A new Key Features section has been added to the Volcano scheduler documentation.
• Core Capabilities Overview: This section provides a high-level overview of Volcano's core capabilities, including unified scheduling on Kubernetes, gang scheduling, hierarchical queues, colocation of online and offline workloads, and extensible scheduling plugins.

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[gemini-code-assist]

Code Review

This pull request introduces a new 'Key Features' page to the Volcano documentation, providing a high-level overview of its core capabilities. The new page is well-structured and clearly written. My review includes a suggestion to enhance this page by adding links to the detailed documentation for each feature, which will improve navigability and make the documentation more interconnected for users.

[aaradhychinche-alt]

@k82cn @Thor-wl
can u review the pr ??

[aaradhychinche-alt]

@hzxuzhonghu the pr is ready to reviewed can u review and merge it when u have time ? thank you !!