docs(perplexity): trim README to match minimal structure (per sjrl review)

Drop installation/usage code samples — code examples will live in the
dedicated docs page that deepset will publish post-merge. Mirrors the
mistral integration README layout.

Author: jliounis

integrations/perplexity/README.md

@@ -3,49 +3,11 @@
 [![PyPI - Version](https://img.shields.io/pypi/v/perplexity-haystack.svg)](https://pypi.org/project/perplexity-haystack)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/perplexity-haystack.svg)](https://pypi.org/project/perplexity-haystack)
 
+- [Integration page](https://haystack.deepset.ai/integrations/perplexity)
 - [Changelog](https://github.com/deepset-ai/haystack-core-integrations/blob/main/integrations/perplexity/CHANGELOG.md)
 
 ---
 
-## Installation
-
-```bash
-pip install perplexity-haystack
-```
-
-## Usage
-
-Set your `PERPLEXITY_API_KEY` and use `PerplexityWebSearch` in a pipeline:
-
-```python
-from haystack import Pipeline
-from haystack.utils import Secret
-from haystack_integrations.components.websearch.perplexity import PerplexityWebSearch
-
-websearch = PerplexityWebSearch(
-    api_key=Secret.from_env_var("PERPLEXITY_API_KEY"),
-    top_k=5,
-)
-result = websearch.run(query="What is Haystack by deepset?")
-documents = result["documents"]
-links = result["links"]
-```
-
-See the [Perplexity Search API reference](https://docs.perplexity.ai/api-reference/search-post) for the full list of supported parameters.
-
-Use `PerplexityChatGenerator` for chat generation through the Perplexity Agent API:
-
-```python
-from haystack.dataclasses import ChatMessage
-from haystack_integrations.components.generators.perplexity import PerplexityChatGenerator
-
-chat_generator = PerplexityChatGenerator(model="openai/gpt-5.4")
-response = chat_generator.run([ChatMessage.from_user("What is Haystack by deepset?")])
-print(response["replies"][0].text)
-```
-
-See the [Perplexity Agent API quickstart](https://docs.perplexity.ai/docs/agent-api/quickstart) for supported parameters.
-
 ## Contributing
 
 Refer to the general [Contribution Guidelines](https://github.com/deepset-ai/haystack-core-integrations/blob/main/CONTRIBUTING.md).