✨ More mobile friendly, fix wrong URL, Hamburger menu

- Hamburger menu on mobile
- title is moved into header on mobile
- Smaller titles on mobile
- Fix wrong import of env in config
- Cleaned up unused imports

astro.config.mjs

@@ -10,13 +10,13 @@ import icon from "astro-icon"
 
 import { loadEnv } from "vite"
 
-const { url } = process.env.URL
-  ? loadEnv(process.env.URL, process.cwd(), "")
-  : { url: "http://localhost:3000" }
+const { URL } = process.env.NODE_ENV
+  ? loadEnv(process.env.NODE_ENV, process.cwd(), "")
+  : { URL: "http://localhost:3000" }
 
 // https://astro.build/config
 export default defineConfig({
-  site: url,
+  site: URL,
   output: "server",
   i18n: {
     defaultLocale: "nb",