Replace default Astro favicon with NBTCA logo

[m1ngsama]

Description:
Currently, the Home project still uses Astro’s default favicon (public/favicon.svg). When users create a browser bookmark, the Astro logo appears instead of our NBTCA’s logo.

Expected behavior:

• Replace the existing public/favicon.svg file with our own NBTCA logo so that bookmarks and browser tabs display the correct branding.
• It would be especially great if, when users add the site to their mobile home screen, our NBTCA logo is displayed instead of the Astro default icon.

Additional context:

• Ensure the new favicon is optimized for both light and dark modes.
• Test across major browsers (Chrome, Edge, Safari, Firefox) after replacement.

[m1ngsama]

https://github.com/nbtca/Home/blob/main/public/favicon.svg

[m1ngsama]