Add initial setup for Gallus_Pub_v1 with Astro

This commit includes a README detailing the Astro starter kit setup and an autogenerated package-lock.json. The setup uses the minimal Astro template, with dependencies like Astro 5.11.0 installed to kickstart the project.

Gallus_Pub_v1/.vscode/extensions.json

@@ -0,0 +1,4 @@
+{
+  "recommendations": ["astro-build.astro-vscode"],
+  "unwantedRecommendations": []
+}