Filename-independent CSS extraction
Filename-independent CSS extraction

Remove the logic to 'intelligently select CSS',
due to issues with nested parent selectors.

Instead, fetch all LZ rules based on a known prefix
for SVG elements. This incrementally improves the
"hard-coded filename" assumption of previous versions,
but we should document this requirement for people
 creating custom data layers.

statgen/locuszoom,statgen/locuszoom,statgen/locuszoom