Updated cost estimates link

Fixes #1911 

I think they must have introduced PTU to the cost calculator, and then defaulted all the old estimates to it, so our estimation was way off. This fixes it. Current estimate is 331.

I will change search tier from Standard to Basic in a subsequent PR.

Author: pamelafox

README.md

@@ -63,7 +63,7 @@ The repo includes sample data so it's ready to try end to end. In this sample ap
 ### Cost estimation
 
 Pricing varies per region and usage, so it isn't possible to predict exact costs for your usage.
-However, you can try the [Azure pricing calculator](https://azure.com/e/d18187516e9e421e925b3b311eec8aae) for the resources below.
+However, you can try the [Azure pricing calculator](https://azure.com/e/f3c9cce59c534d45bdd82f4515ac6635) for the resources below.
 
 - Azure App Service: Basic Tier with 1 CPU core, 1.75 GB RAM. Pricing per hour. [Pricing](https://azure.microsoft.com/pricing/details/app-service/linux/)
 - Azure OpenAI: Standard tier, GPT and Ada models. Pricing per 1K tokens used, and at least 1K tokens are used per question. [Pricing](https://azure.microsoft.com/pricing/details/cognitive-services/openai-service/)