Few tweaks to astro config. (#1068)

## Configuration Improvements

### Changes to `astro.config.mjs`:
- Added build-time environment variable definition
- Configured Vite alias for `$` to resolve from `./src`
- Enabled minification for production builds
- Added path resolution for `__dirname` in ES module context

### Updates to `tsconfig.json`:
- Added TypeScript path alias for `$*` to map to `src/*`

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ege Akman <[email protected]>

Author: 3 people

astro.config.mjs

@@ -1,3 +1,5 @@
+import path, { dirname } from "path";
+import { fileURLToPath } from "url";
 import { defineConfig } from "astro/config";
 import mdx from "@astrojs/mdx";
 import { h } from "hastscript";
@@ -10,8 +12,21 @@ import rehypeAutolinkHeadings from "rehype-autolink-headings";
 import metaTags from "astro-meta-tags";
 import pagefind from "astro-pagefind";
 
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename); // @type-check enabled!
+
 // https://astro.build/config
 export default defineConfig({
+  vite: {
+    define: {
+      "process.env.VITE_BUILD_TIME": JSON.stringify(new Date().toISOString()),
+    },
+    resolve: {
+      alias: {
+        $: path.resolve(__dirname, "./src"),
+      },
+    },
+  },
   markdown: {
     remarkPlugins: [
       [
@@ -34,7 +49,7 @@ export default defineConfig({
       ],
     ],
   },
-  site: "https://ep2025.europython.eu",
+  site: process.env.SITE_URL || "https://ep2025.europython.eu",
   redirects: {
     "/c-api-summit/": "/programme/c-api-summit/",
     "/programme/cfp/": "/programme/cfp/",
@@ -56,4 +71,7 @@ export default defineConfig({
     pagefind(),
   ],
   output: "static",
+  build: {
+    minify: true,
+  },
 });

tsconfig.json

@@ -3,6 +3,14 @@
   "compilerOptions": {
     "strictNullChecks": true,
     "jsx": "react-jsx",
-    "jsxImportSource": "react"
+    "jsxImportSource": "react",
+    "paths": {
+      "@components/*": ["src/components/*"],
+      "@layouts/*": ["src/layouts/*"],
+      "@ui/*": ["src/components/ui/*"],
+      "@assets/*": ["src/assets/*"],
+      "@i18n/*": ["src/i18n/*"],
+      "@src/*": ["src/*"]
+    }
   }
 }