chore: update README to reflect new build workflow and correct image tag

Author: sliedig

README.md

@@ -1,9 +1,9 @@
-[![Build & Test Workflow](https://github.com/aws-samples/aws-serverless-developer-experience-workshop-python/actions/workflows/build_test.yml/badge.svg)](https://github.com/aws-samples/aws-serverless-developer-experience-workshop-python/actions/workflows/build_test.yml)
-
-< img src="./docs/workshop_logo.png" alt="AWS Serverless Developer Experience Workshop Reference Architecture" width="80%" />
+[![Build & Test Workflow](https://github.com/aws-samples/aws-serverless-developer-experience-workshop-python/actions/workflows/build.yml/badge.svg)](https://github.com/aws-samples/aws-serverless-developer-experience-workshop-python/actions/workflows/build.yml)
 
 # AWS Serverless Developer Experience workshop reference architecture (Python)
 
+<img src="./docs/workshop_logo.png" alt="AWS Serverless Developer Experience Workshop Reference Architecture" width="80%" />
+
 This repository contains the Python reference architecture for the AWS Serverless Developer Experience workshop.
 
 The AWS Serverless Developer Experience Workshop is a comprehensive, hands-on training program designed to equip developers with practical serverless development skills using the [**AWS Serverless Application Model (AWS SAM)**](https://aws.amazon.com/serverless/sam/) and **AWS SAM CLI**.