[Docs] Sync docs_new with legacy docs and update migration redirects (#23337)

Co-authored-by: Mingyi <wisclmy0611@gmail.com>

docs_new/docs/basic_usage/deepseek_ocr.mdx

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+---
+title: "DeepSeek OCR (OCR-1 / OCR-2)"
+metatags:
+    description: "DeepSeek OCR models are multimodal (image + text) models for OCR and document understanding."
+---
+
+DeepSeek OCR models are multimodal (image + text) models for OCR and document understanding.
+
+## Launch server
+
+```shell
+python -m sglang.launch_server \
+  --model-path deepseek-ai/DeepSeek-OCR-2 \
+  --trust-remote-code \
+  --host 0.0.0.0 \
+  --port 30000
+```
+
+> You can replace `deepseek-ai/DeepSeek-OCR-2` with `deepseek-ai/DeepSeek-OCR`.
+
+## Prompt examples
+
+Recommended prompts from the model card:
+
+```
+<image>
+<|grounding|>Convert the document to markdown.
+```
+
+```
+<image>
+Free OCR.
+```
+
+## OpenAI-compatible request example
+
+```python
+import requests
+
+url = "http://localhost:30000/v1/chat/completions"
+
+data = {
+    "model": "deepseek-ai/DeepSeek-OCR-2",
+    "messages": [
+        {
+            "role": "user",
+            "content": [
+                {"type": "text", "text": "<image>\n<|grounding|>Convert the document to markdown."},
+                {"type": "image_url", "image_url": {"url": "https://example.com/your_image.jpg"}},
+            ],
+        }
+    ],
+    "max_tokens": 512,
+}
+
+response = requests.post(url, json=data)
+print(response.text)
+```