Fix base path for GitHub Pages deploy

Update the Astro site base to `/launchpad` for GitHub Pages hosting, and make the language picker prepend the configured base path so locale links resolve correctly under the project subpath.

Author: roicort

astro.config.mjs

@@ -12,7 +12,7 @@ import icon from "astro-icon";
 // https://astro.build/config
 export default defineConfig({
   site: "https://roicort.github.io",
-  base: "/",
+  base: "/launchpad",
   integrations: [mdx(), sitemap(), pagefind(), icon()],
 
   vite: {

src/components/LanguagePicker.astro

@@ -1,6 +1,7 @@
 ---
 import { languages } from '../i18n/ui';
 import { getLangFromUrl, useTranslatedPath } from '../i18n/utils';
+import { withBase } from '../utils/slugify';
 
 const lang = getLangFromUrl(Astro.url);
 const translatePath = useTranslatedPath(lang);
@@ -24,7 +25,7 @@ const currentLabel = languages[lang];
               'language-picker__option',
               isCurrent && 'language-picker__option--active',
             ]}
-            href={translatePath('/', l)}
+            href={withBase(translatePath('/', l))}
             aria-current={isCurrent ? 'page' : undefined}
           >
             <span class="language-picker__option-code" aria-hidden="true">{l.toUpperCase()}</span>