docs: refresh README with latest release notes and formatting

[Qubitium]

Summary

Refreshed the README to keep it aligned with the latest project state and easier to scan.

What Changed

• Updated Latest News with the most recent quantization and model-support additions on main.
• Normalized the pre-release version label to 7.4.0-dev for consistency.
• Corrected the Evalution benchmark count from 150+ to 153.
• Fixed the Special Notes code block formatting and the EoRA capitalization typo.
• Added visual formatting to section headings.

Tests

README-only change; no functional or API changes. No unit tests needed.

Review Requirements

• I personally reviewed every file in this diff.
• I checked that the changes match existing project conventions.
• I avoided unnecessary code changes.

Notes

No migration notes, risks, or compatibility concerns. This is a documentation-only update.

Link to Devin session: https://app.devin.ai/sessions/cc6fe0917fc9498daa7615a56ca5d1f8
Requested by: @Qubitium

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