Fix the favicon for the starter example

[gtnbssn]

Changes

• the favicon was in fact a text file with this content: https://rawcdn.githack.com/withastro/astro/main/examples/starter/public/favicon.ico
• my browser was displaying another favicon it had cached somehow, but it was also triggering 404 of course
• this is the actual image, fetched from another example

Testing

If you really have to:

npm init astro testFavicon
cd testFavicon
npm i
npm run dev

Docs

Probably not required.

[natemoo-re]

Thanks! Not sure what happened here, but really appreciate the fix!