docs: update readme

Removed news section detailing past updates and milestones.

Author: pancacake

README.md

@@ -40,17 +40,6 @@
 
 > **[2026.4.4]** [v1.0.0-beta.1](https://github.com/HKUDS/DeepTutor/releases/tag/v1.0.0-beta.1) — Agent-native architecture rewrite (～200k lines) with two-layer plugin model (Tools + Capabilities), CLI & SDK entry points, TutorBot multi-channel bot agent, Co-Writer, Guided Learning, and persistent memory.
 
-### 📰 News
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-> **[2026.4.4]** Long time no see! ✨ DeepTutor v1.0.0 is finally here — an agent-native evolution featuring a ground-up architecture rewrite, TutorBot, and flexible mode switching under the Apache-2.0 license. A new chapter begins, and our story continues! 
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-> **[2026.2.6]** 🚀 We've reached 10k stars in just 39 days! A huge thank you to our incredible community for the support! 
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-> **[2026.1.1]** Happy New Year! Join our [Discord](https://discord.gg/eRsjPgMU4t), [WeChat](https://github.com/HKUDS/DeepTutor/issues/78), or [Discussions](https://github.com/HKUDS/DeepTutor/discussions) — let's shape the future of DeepTutor together!
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-> **[2025.12.29]** DeepTutor is officially released!
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-
 <details>
 <summary><b>Past releases</b></summary>