docs: add integrations, revamp docs (#693)

Signed-off-by: Panos Vagenas <35837085+vagenas@users.noreply.github.com>

docs/integrations/crewai.md

@@ -0,0 +1,10 @@
+Docling is available in [CrewAI](https://www.crewai.com/) as the `CrewDoclingSource`
+knowledge source.
+
+- 💻 [Crew AI GitHub][github]
+- 📖 [Crew AI knowledge docs][docs]
+- 📦 [Crew AI PyPI][package]
+
+[github]: https://github.com/crewAIInc/crewAI/
+[docs]: https://docs.crewai.com/concepts/knowledge
+[package]: https://pypi.org/project/crewai/

docs/integrations/nvidia.md

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+Docling is powering the NVIDIA *PDF to Podcast* agentic AI blueprint:
+
+- [🏠 PDF to Podcast home](https://build.nvidia.com/nvidia/pdf-to-podcast)
+- [💻 PDF to Podcast GitHub](https://github.com/NVIDIA-AI-Blueprints/pdf-to-podcast)
+- [📣 PDF to Podcast announcement](https://nvidianews.nvidia.com/news/nvidia-launches-ai-foundation-models-for-rtx-ai-pcs)
+- [✍️ PDF to Podcast blog post](https://blogs.nvidia.com/blog/agentic-ai-blueprints/)

docs/integrations/opencontracts.md

@@ -1,10 +1,5 @@
 Docling is available an ingestion engine for [OpenContracts](https://github.com/JSv4/OpenContracts), allowing you to use Docling's OCR engine(s), chunker(s), labels, etc. and load them into a platform supporting bulk data extraction, text annotating, and question-answering:
 
-- 💻 [GitHub](https://github.com/JSv4/OpenContracts)
-- 📖 [Docs](https://jsv4.github.io/OpenContracts/)]
-
- #### Docling in Action!
-
-![docling relationships visualized in pdf](https://github.com/JSv4/OpenContracts/blob/main/docs/assets/images/gifs/PDF%20Annotation%20Flow.gif)
-
-
+- 💻 [OpenContracts GitHub](https://github.com/JSv4/OpenContracts)
+- 📖 [OpenContracts Docs](https://jsv4.github.io/OpenContracts/)
+- ▶️ [OpenContracts x Docling PDF annotation screen capture](https://github.com/JSv4/OpenContracts/blob/main/docs/assets/images/gifs/PDF%20Annotation%20Flow.gif)