chore: 🛠️ migrate site to Astro framework

Switches from vanilla HTML/CSS to Astro framework, setting up proper project structure and component-based architecture while preserving existing design and functionality.

web/.gitignore

@@ -0,0 +1,24 @@
+# build output
+dist/
+
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/

web/astro.config.mjs

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