[Docs] Update README.md and docs homepage

[dsikka]

Purpose

• Update readme with latest models and an updated what's new section
• Fix docs homepage

I have filled in:

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan/results, such as providing test command and pasting the results.
• (Optional) The necessary documentation update.
• I (a human) have written or reviewed the code in this pr to the best of my ability.

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📝 Walkthrough

Walkthrough

Changes

Supported model documentation

Layer / File(s)	Summary
Algorithm announcements README.md	The What’s New section adds DSpark training support and removes two previous speculator announcements.
Qwen3 support matrix README.md, docs/index.md	Qwen3 and Qwen3 MoE entries now include expanded DFlash and P-EAGLE speculator listings with updated table structure.
Additional model support README.md, docs/index.md	Mistral Small 4 replaces Mistral 3 Large, and Nemotron 3 Ultra and Super are added with DFlash support.

Possibly related PRs

• vllm-project/speculators#435: Updates the same README sections with related DFlash and model entries.
• vllm-project/speculators#520: Adjusts Qwen3 and DFlash/EAGLE-3/P-EAGLE listings in the README.
• vllm-project/speculators#849: Adds related DSpark documentation and navigation updates.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main docs updates in the PR.
Description check	✅ Passed	The description is related to the README and docs homepage updates made in this changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[mergify]

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🟢 Require approval from approved reviewers list

All pull requests must have at least one approving review from a member of the approved reviewers list before merging.

• any of:
  • approved-reviews-by = shanjiaz
  • approved-reviews-by = dsikka
  • approved-reviews-by = fynnsu
  • approved-reviews-by = orestis-z
  • approved-reviews-by = rahul-tuli

[shanjiaz]

Thanks for updating, maybe this could be an agent task in the future in case we forget.