[FEAT] add favicon

[3DJupp]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Hey, i just realized, that it should be possible to have the matching favicon aswell:

Thats used for the icon:
curl -o /kclient/public/icon.png https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/bambustudio-logo.png

And thats for the favicon:
curl -o /kclient/public/favicon.ico https://bambulab.com/favicon.ico

Reason for change

Because it possible and visually pretty nice to have 👍

Proposed code change

just add a line (curl -O) in the Dockerfile

[github-actions]

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