Graphs in Chisel Documentation not very readable in dark mode
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Current evaluation
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Issue body
### Request type
Fix
### What needs to get done
The SVG showing the slicing contains black arrows on a transparent background. This means that when reading in dark mode, this is barely visible, thanks to the dark background of the page.
The graphic there should be made more readable in dark mode.
### Documentation location
https://documentation.ubuntu.com/rockcraft/en/latest/explanation/chisel
### Additional information
Here's a screenshot from Firefox 137.0b3: 
Evaluation history
No evaluation history available.