Update translations and enhance development.astro with static path support

- Revise introductory text in translations for clarity and consistency across multiple languages.
- Add static paths for language support in development.astro to improve routing for internationalization.

src/pages/[lang]/development.astro

@@ -63,6 +63,15 @@ function getContributionData(commits) {
 }
 
 const contributionData = getContributionData(commits);
+
+export async function getStaticPaths() {
+  return [
+    { params: { lang: 'en' } },
+    { params: { lang: 'nl' } },
+    { params: { lang: 'de' } },
+    { params: { lang: 'fr' } },
+  ];
+}
 ---
 
 <Layout metadata={metadata}>