refactor: use emoji favicon instead of ico format

[johannschopplich]

I feel like that's a more 2022 solution to an ico file.

Edit: Will have to serve a placeholder for the favicon.ico to omit an extra HTTP request...

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[pi0]

Thanks for this PR @johannschopplich but actually it was intentional to test the serve static feature! Would you mind to copy it to a .svg file referenced by path?

[johannschopplich]

You're right. Thanks for the hint. Done! The new favicon is served from /favicon.svg.