[Refector] Remove mammothmodal2-preview example (#5335)

Signed-off-by: princepride <wangzhipeng628@gmail.com>
Signed-off-by: 汪志鹏 <wangzhipeng628@gmail.com>

docs/user_guide/examples/offline_inference/mammothmodal2_preview.md

@@ -1,35 +0,0 @@
-# MammothModa2-Preview
-
-Source <https://github.com/vllm-project/vllm-omni/tree/main/examples/offline_inference/mammothmodal2_preview>.
-
-
-## Run examples (MammothModa2-Preview)
-
-Download model
-```bash
-hf download bytedance-research/MammothModa2-Preview --local-dir ./MammothModa2-Preview
-```
-
-### Text-to-Image (T2I)
-
-Text-to-image now runs through the shared offline image example
-(`examples/offline_inference/text_to_image/text_to_image.py`). See the recipe
-`recipes/MammothModa2/MammothModa2-Preview.md` for the full command and the
-`extra_body` knobs (`text_guidance_scale`, `cfg_range`, `num_inference_steps`).
-
-### Image Summary
-
-```bash
-python examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py \
-  --model ./MammothModa2-Preview \
-  --deploy-config ./vllm_omni/deploy/mammoth_moda2_ar.yaml \
-  --question "Summarize this image." \
-  --image ./image.png
-```
-
-## Example materials
-
-??? abstract "run_mammothmoda2_image_summarize.py"
-    ``````py
-    --8<-- "examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py"
-    ``````