Cleanup old postman_collections link from README (#42)

* Cleanup old postman_collections link from README

* Update README.md

---------

Co-authored-by: Preetam Joshi <info@aimon.ai>
Co-authored-by: Alexander <alex.grig.lyzhov@gmail.com>

Author: 3 people

README.md

@@ -22,10 +22,6 @@ The following is a list of quality metrics that are currently available and on o
 
 ## Getting Started
 
-You can use AIMon either through an SDK or through an API. Below you will find instructions on 1. how to use the SDK along with AIMon's UI and 2. how you could use it directly through our REST APIs.
-
-### 1. SDK and UI
-
 AIMon supports asynchronous instrumentation or synchronous detections for the metrics mentioned above. Use these steps
 to get started with using the AIMon SDK and the product.
 
@@ -53,14 +49,6 @@ def my_llm_app(context, query):
     <img src="images/product_apps_page.png" alt="AIMon Product">
 </div>
 
-### 2. API
-
-AIMon detections can be accessed via REST APIs. Here are the steps to access the API:
-
-- Step 1: Get your API key by requesting it on our [Slack](https://join.slack.com/t/generativeair/shared_invite/zt-2jab62lsj-xM9a_s~Qweu8lf3YS2cANg) or sending an email
-  to info@aimon.ai
-- Step 2: Download the [Postman Collection](examples/postman_collections) specified below to access the API
-
 ## Benchmarks
 
 ### Hallucination Detection