docs: add Hierarchical Queue feature introduction

[aaradhychinche-alt]

Summary

This PR adds an initial introduction and usage guide for the Hierarchical Queue feature under the Key Features section.

Changes

• Added a new Hierarchical Queue documentation page
• Explained the motivation for hierarchical queues
• Described the difference between capacity and proportion queue models
• Outlined common use cases

This is a follow-up to the Key Features foundation and contributes to improving feature documentation on the website.

Refs #330

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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 significantly enhances the project's documentation by adding a comprehensive introduction to the Hierarchical Queue feature. It clarifies the core concept, explains why such a feature is crucial in modern cluster management, and differentiates between the available queue models, thereby providing a foundational understanding for users and administrators. This addition is a step towards improving the overall feature documentation on the website.

Highlights

• New Documentation Page: Introduced a new documentation page for the 'Hierarchical Queue' feature under the 'Key Features' section.
• Feature Introduction: Provided an initial introduction to Hierarchical Queues, explaining their purpose in organizing workloads into multi-level queues for fine-grained resource management and fair sharing.
• Motivation Explained: Detailed the necessity of Hierarchical Queues in shared Kubernetes clusters to address resource competition, provide isolation, enforce quotas, and improve fairness.
• Queue Models: Described two primary queue models supported by Volcano: 'Capacity Queue' (for maximum resource limits and strong isolation) and 'Proportion Queue' (for percentage-based resource allocation and fair sharing).
• Use Cases: Outlined typical use cases for Hierarchical Queues, including multi-tenant clusters, AI/big data platforms, and enterprise environments requiring both fairness and isolation.

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[gemini-code-assist]

Code Review

This pull request adds a new documentation page introducing the Hierarchical Queue feature. The new page serves as a good high-level overview. I've suggested a couple of improvements to enhance clarity and accuracy. Specifically, I've recommended clarifying the description of the 'Capacity Queue' model to avoid confusion with the 'capability' property, and adding a link to the existing detailed user guide for hierarchical queues. These changes will make the documentation more accurate and helpful for users.

[aaradhychinche-alt]

@Arhell @kevin-wangzefeng
can You please review this pr when You have time ?