docs: refactor README.md labels

- Change the labels of GitHub Workflow Status and Last Commit from uppercase to proper case in the README.md file

Signed-off-by: 陳鈞 <[email protected]>

README.md

@@ -30,7 +30,7 @@ Install the NVIDIA Container Toolkit with this guide.
 
 ## 📦 Available Pre-built Image
 
-![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/jim60105/docker-whisperX/docker_publish.yml?label=DOCKER%20BUILD&style=for-the-badge) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/jim60105/docker-whisperX/master?label=DATE&style=for-the-badge)
+![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/jim60105/docker-whisperX/docker_publish.yml?label=Docker%20Build) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/jim60105/docker-whisperX/master?label=Date)
 
 > [!NOTE]  
 > The WhisperX code base in these images aligns with the git submodule commit hash.