fix(2025): delete footer

Author: ryoppippi

2025/src/pages/ja.astro

@@ -81,8 +81,6 @@ import AnnouncementSlides from '../components/AnnouncementSlides.astro';
       </p>
     </div>
   </section>
-  <footer style="background: linear-gradient(240deg, #9ebd13 0%, #069700 100%); color: #fff; text-align: center; padding: 20px 0;">
-  </footer>
 </Layout>
 
 <style>