Replace Serverless API to Platform announcement on README page (#4003)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: ryannikolaidis <1208590+ryannikolaidis@users.noreply.github.com>

Author: 3 people

README.md

@@ -39,14 +39,9 @@
 
 The `unstructured` library provides open-source components for ingesting and pre-processing images and text documents, such as PDFs, HTML, Word docs, and [many more](https://docs.unstructured.io/open-source/core-functionality/partitioning). The use cases of `unstructured` revolve around streamlining and optimizing the data processing workflow for LLMs. `unstructured` modular functions and connectors form a cohesive system that simplifies data ingestion and pre-processing, making it adaptable to different platforms and efficient in transforming unstructured data into structured outputs.
 
-## Try the Unstructured Serverless API!
-
-Looking for better pre-processing performance and less setup?
-Check out our new [Serverless API](https://unstructured.io/api-key-hosted)!
-The Unstructured Serverless API is our most performant API yet, delivering a more responsive,
-production-grade solution to better support your business and LLM needs.
-Head to our [signup page](https://app.unstructured.io/) page to get started for
-free.
+## Try the Unstructured Platform Product
+
+Ready to move your data processing pipeline to production, and take advantage of advanced features? Check out [Unstructured Platform](https://unstructured.io/enterprise). In addition to better processing performance, take advantage of chunking, embedding, and image and table enrichment generation, all from a low code UI or an API. [Request a demo](https://unstructured.io/contact) from our sales team to learn more about how to get started.
 
 ## :eight_pointed_black_star: Quick Start