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/astro.config.mjs

@@ -0,0 +1,5 @@
+// @ts-check
+import { defineConfig } from 'astro/config';
+
+// https://astro.build/config
+export default defineConfig({});