docs(readme): use GitHub native badges for workflow status

GitHub native badges show actual status and work for private repos.
shields.io cannot access GitHub API for private repos.

Author: CalvinAllen

README.md

@@ -2,8 +2,8 @@
 
 **Clone a repo. Run tasks. No setup required.**
 
-[![Build & Test](https://img.shields.io/badge/Build%20%26%20Test-passing-brightgreen?style=for-the-badge)](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/build.yml)
-[![Integration Tests](https://img.shields.io/badge/Integration%20Tests-passing-brightgreen?style=for-the-badge)](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/integration-test.yml)
+[![Build & Test](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/build.yml/badge.svg)](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/build.yml)
+[![Integration Tests](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/integration-test.yml/badge.svg)](https://github.com/CodingWithCalvin/rnr.cli/actions/workflows/integration-test.yml)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=for-the-badge)](https://opensource.org/licenses/MIT)
 
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