[Bug] most .chal files aren't linux compatible

[TriRetr0]

Describe the bug (it's not really a bug)
The wiki and tools for .chal files aren't linux compatible, windows uses ' \' (written as \\) for paths but linux uses '/' instead.

To Reproduce
Steps to reproduce the behavior:

1. Download .chal files and put them in the songs folder
2. Go to Challenges
3. See error: Challenge missing required chart

Expected behavior
Challenges load normally

Desktop (please complete the following information):

• OS: Linux
• GPU: doesn't matter
• CPU: doesn't matter
• Version: 0.5.0 Git commit: 2022-07-27_5253994f

Solution?
It's not a big issue and works well when they are replaced ("sed -i 's/\\///g' *" in the folder containing those if someone has the same issue, it will fix them all instantly)