### What this PR does / why we need it?
Add graph mode and improve on multi_npu_moge.md
### Does this PR introduce _any_ user-facing change?
yes
### How was this patch tested?
CI passed with new existing test.
- vLLM version: v0.9.2
- vLLM main:
5a7fb3ab9e
Signed-off-by: GDzhu01 <809721801@qq.com>
### What this PR does / why we need it?
Cleanup ununsed doc for MoGE model, we will add back this when MoGE
model ready.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
CI passed
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>