Remove unused extensions from devcontainer.json for a cleaner setup

- Eliminated "redhat.vscode-yaml" and "shd101wyy.markdown-preview-enhanced" extensions to streamline the development environment.
- This change helps reduce clutter and focuses on essential tools for improved efficiency.

.devcontainer/devcontainer.json

@@ -12,12 +12,10 @@
 				"streetsidesoftware.code-spell-checker",
 				"eamodio.gitlens",
 				"GitHub.copilot",
-				"redhat.vscode-yaml",
 				"sissel.shopify-liquid",
 				"esbenp.prettier-vscode",
 				"bierner.markdown-preview-github-styles",
 				"bierner.markdown-emoji",
-				"shd101wyy.markdown-preview-enhanced",
 				"ms-vscode.live-server",
 				"davidhouchin.whitespace-plus",
 				"formulahendry.auto-close-tag",