docs: add Docling Serve integration page

integrations/docling-serve.md

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+---
+layout: integration
+name: Docling Serve
+description: Use Docling Serve to convert PDF, DOCX, HTML, and other document types to Haystack Documents via a remote HTTP server, with no local ML dependencies
+authors:
+    - name: deepset
+      socials:
+        github: deepset-ai
+pypi: https://pypi.org/project/docling-serve-haystack
+repo: https://github.com/deepset-ai/haystack-core-integrations/tree/main/integrations/docling_serve
+type: Data Ingestion
+report_issue: https://github.com/deepset-ai/haystack-core-integrations/issues
+logo: /logos/docling.png
+version: Haystack 2.0
+toc: true
+---
+### **Table of Contents**
+- [Overview](#overview)
+- [Installation](#installation)
+- [Usage](#usage)
+- [License](#license)
+
+## Overview
+
+[Docling Serve](https://github.com/docling-project/docling-serve) hosts [Docling](https://github.com/DS4SD/docling)
+as a scalable HTTP server, supporting PDFs, Office documents, HTML, and many other formats. All document
+parsing happens on the remote server, with no local ML dependencies.
+
+## Installation
+
+```bash
+pip install docling-serve-haystack
+```
+
+Start a Docling Serve instance locally (requires Docker):
+
+```bash
+docker run -p 5001:5001 ghcr.io/docling-project/docling-serve-cpu:latest
+```
+
+## Usage
+
+### Components
+
+`DoclingServeConverter` converts documents by sending them to a Docling Serve HTTP server. Local files and `ByteStream` objects are uploaded via the `/v1/convert/file` endpoint. URL strings are
+sent to `/v1/convert/source`.
+
+The component supports three export modes via the `export_type` parameter:
+
+- `ExportType.MARKDOWN` (default): Returns document content as a Markdown string.
+- `ExportType.TEXT`: Returns plain text extracted from the document.
+- `ExportType.JSON`: Returns the full Docling document representation as a JSON string.
+
+### Standalone
+
+```python
+from haystack_integrations.components.converters.docling_serve import (
+    DoclingServeConverter,
+)
+
+# Default: Markdown output
+converter = DoclingServeConverter(base_url="http://localhost:5001")
+result = converter.run(sources=["https://arxiv.org/pdf/2602.17316"])
+documents = result["documents"]
+print(documents[0].content[:200])
+```
+
+### In a Pipeline
+
+```python
+from haystack import Pipeline
+from haystack.components.preprocessors import DocumentSplitter
+from haystack.components.writers import DocumentWriter
+from haystack.document_stores.in_memory import InMemoryDocumentStore
+from haystack_integrations.components.converters.docling_serve import (
+    DoclingServeConverter,
+)
+
+document_store = InMemoryDocumentStore()
+
+pipeline = Pipeline()
+pipeline.add_component(
+    "converter",
+    DoclingServeConverter(base_url="http://localhost:5001"),
+)
+pipeline.add_component("splitter", DocumentSplitter())
+pipeline.add_component("writer", DocumentWriter(document_store=document_store))
+pipeline.connect("converter", "splitter")
+pipeline.connect("splitter", "writer")
+
+pipeline.run({"converter": {"sources": ["https://arxiv.org/pdf/2602.17316"]}})
+```
+
+### License
+
+`docling-serve-haystack` is distributed under the terms of the Apache-2.0 license.