feat:Soai application form with the backend starpi

What does this MR do and why?

This MR centralizes the website's navigation by creating a reusable Navbar component and removes UI clutter (progress circles) from the SOAI application forms.

🚀 Key Features

• Navbar Component: Created src/components/Navbar.astro with logo, navigation links, and icons in a centered horizontal row.
• Layout Centering: Added max-w-7xl mx-auto container to center navbar content.
• SOAI Form Cleanup: Removed progress indicator circles from soai-application.astro and internships/task.astro.

❓ Why this change?

• Provides consistent navbar across all pages using PageLayout.
• Removes visual clutter from application forms.

✅ Checklist

•  Navbar created

•  PageLayout updated

•  Progress circles removed

•  Navbar centered

  ScreenShots

  Before

  

  After