[🚀] Replace current export with CSV generator for CTFd

[bkimminich]

As a replacement for the current export generator, CTFd's new CSV import feature should be used: https://docs.ctfd.io/docs/imports/csv

This should be a much more stable approach than the current direct export, which is not even properly supported in CTFd Docker containers any longer.

[bkimminich]

Analysis showed that some functionality would be lost currently unless the following tickets get addressed:

• Hints in CSV export/import CTFd/CTFd#2038 (currently hint costs are not supported. All hints would be free)
• CSV hints with commas get split on imports CTFd/CTFd#2395 (currently all hints that themselves contain commas would be split into nonsensical pieces during import. As a workaround, commas could be removed from text hints. In the URL hints, commas are not appearing. The code snippet hints would not work because they contain a lot of commas, unless some "comma-look-a-like" ASCII char would be used to replace them before exporting the CSV 💡Workaround: Replacing ٬ with ٬ (Arabic Thousands Separator Unicode char) in all hints