Allow to switch the icon to code-server icon

[krassowski]

Currently the VS Code icon is used even when code-server is run. This is problematic because the Visual Studio Code icon is a Microsoft trademark and should not be used to represent products other than VS Code as per https://code.visualstudio.com/brand

Proposed solution:

• ship the code-server icon (https://github.com/coder/code-server/blob/main/src/browser/media/favicon.svg) as well
• allow to switch the icon based on an environment variable config

Any thoughts/counter ideas before I open a PR?

[benz0li]

Better use https://github.com/coder/code-server/blob/f15580b28ae021b549a723847497d6f8252b3eb2/src/browser/media/favicon-dark-support.svg

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Because of https://bugs.webkit.org/show_bug.cgi?id=199134, this does not (yet) work with Safari, though.

Therefore, I created https://github.com/b-data/jupyterlab-python-docker-stack/blob/42b36973157f29ec867a9489aa9c20e387873f60/base/assets/opt/code-server/code-server.svg

[krassowski]

Good point on dark/light. prefers-color-scheme does not reflect the Jupyter theme (the browser/system may be set to dark but user may be using light theme). Instead we can add jp-icon0 class which will automatically swap the fill between black and white depending on theme

https://jupyterlab.readthedocs.io/en/latest/api/modules/ui_components.html#md:sync-icon-color-to-jupyterlab-theme