[docs] fix concept site references

[slin1237]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @slin1237, 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 updates the project's core documentation by refining the _index.md file within the concepts section. The changes involve removing references to deprecated or moved concept pages and introducing links to newly added documentation for 'Ingress' and 'Benchmarks', ensuring the documentation remains current and accurately reflects the available concepts.

Highlights

• Documentation Cleanup: Removed outdated or irrelevant links and descriptions for 'Dedicated AI Cluster' and 'Dedicated AI Cluster Profile' from the main concepts index page.
• New Concept Introductions: Added new sections and links to 'Ingress' and 'Benchmarks' concept documentation pages, expanding the range of topics covered in the concepts overview.

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[gemini-code-assist]

Code Review

This pull request updates the concepts documentation by removing sections for Dedicated AI Cluster and Dedicated AI Cluster Profile, and adding new sections for Ingress and Benchmarks. While the reorganization is logical, the new link to the Benchmarks documentation is broken because the target file is missing. This should be addressed before merging.

[gemini-code-assist]

This change introduces a new 'Benchmarks' section, but the link /ome/docs/concepts/benchmarks appears to be broken. Based on the file list provided for review, the corresponding content file site/content/en/docs/concepts/benchmarks.md seems to be missing.

A broken link prevents users from accessing important information. Given this pull request aims to fix site references, it's crucial to ensure all new links are valid.

Could you please either:

• Add the benchmarks.md content file to this pull request.
• Remove this section for now if the content is not yet ready.