Use whitenoise for static file handling

[SchrodingersGat]

• Fixes PUI CORS issues only with the default part image  #5948
• Uses whitenoise as a replacement for django's built-in static file server
• Still really only useful for "development" - as whitenoise is not a recommended solution for serving media files

Example

• Running local dev server at http://localhost:8000
• vite server running at http://localhost:5173
• allows CORS requests for static files

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[SchrodingersGat]

@LavissaWoW @wolflu05 @matmair after much reading, this seems like the only reliably way around this issue. Even though it is a very small target for the issue (static file CORS in dev mode, from the vite server), this seems like a reasonable solution.

I looked into whether this would be a good solution for serving static / media files in general - however it does not handle media files. So, stuck with Caddy (or similar) solution for now

[LavissaWoW]

@SchrodingersGat Probably unrelated, but should we fix the favicon 404 too?

[SchrodingersGat]

@LavissaWoW I've forgotten the favicon issue, can you remind me?

[LavissaWoW]

@SchrodingersGat I'm not able to reliably reproduce the console error message.
But any tab showing PUI lacks the favicon on its tab icon. And I regularly get a 404 error in the console for /favicon.ico

[SchrodingersGat]

Ok if you see it again please raise an issue :)