Update .devcontainer/devcontainer.json

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: rocketstack-matt

.devcontainer/devcontainer.json

@@ -18,7 +18,6 @@
 	"customizations": {
 		"vscode": {
 			"extensions": [
-                "astro-build.astro-vscode",
                 "bierner.markdown-mermaid",
                 "davidanson.vscode-markdownlint",
                 "esbenp.prettier-vscode",