[docs]: update the web docs structure (#1622)

Author: KMSorSMS

doc/SUMMARY.md

@@ -1,18 +1,20 @@
 # Ktransformers
 
 [Introduction](./README.md)
-# Install
-- [Installation Guide for kt-kernel](en/kt-kernel_intro.md)
-- [SFT user guide](en/KTransformers-Fine-Tuning_User-Guide.md)
+# Install & Usage
+- [For kt-kernel](en/kt-kernel_intro.md)
+- [For SFT](en/KTransformers-Fine-Tuning_User-Guide.md)
 
 # Tutorial 
-- [Deepseek-R1/V3 Show Case/Tutorial](en/DeepseekR1_V3_tutorial.md)
-- [Why KTransformers So Fast](en/deepseek-v2-injection.md)
+## SFT part
+<!-- - [Deepseek-R1/V3 Show Case/Tutorial](en/DeepseekR1_V3_tutorial.md) -->
+<!-- - [Why KTransformers So Fast](en/deepseek-v2-injection.md) -->
 - [Injection Tutorial](en/injection_tutorial.md)
 - [Multi-GPU Tutorial](en/multi-gpu-tutorial.md)
 - [Use FP8 GPU Kernel](en/fp8_kernel.md)
 - [Use AMD GPU](en/ROCm.md)
 - [SFT developer tech notes](en/KTransformers-Fine-Tuning_Developer-Technical-Notes.md)
+## KT-kernel part
 <!-- # For Developer
 - [Makefile Usage](en/makefile_usage.md) -->