remove test badge (doesn't apply to main branch)

Author: jifalops

README.md

@@ -1,6 +1,5 @@
 # API Rust
 
-[![.github/workflows/test.yml](https://github.com/jifalops/api-rust/actions/workflows/test.yml/badge.svg)](https://github.com/jifalops/api-rust/actions/workflows/test.yml)
 [![.github/workflows/deploy_lambda.yml](https://github.com/jifalops/api-rust/actions/workflows/deploy_lambda.yml/badge.svg)](https://github.com/jifalops/api-rust/actions/workflows/deploy_lambda.yml)
 
 A template repo for building a Rust/Axum API using a dev-container.