[openstreetmap/openstreetmap-website] Store routing icons separately (PR #6189)

[Anton Khorev]

@AntonKhorev commented on this pull request.



> +module OpenStreetMap
+  class SvgCurrentColorTransform < InlineSvg::CustomTransformation
+    def transform(doc)
+      doc.xpath("//@fill|//@stroke").each do |attr|
+        attr.value = "currentColor" if attr.value.strip.downcase == value
+      end
+      doc
+    end
+  end

It's not going to be the actual current color when opened as an external file, but the color seems to be defaulting to black[^1] in everything I opened it with.

[^1]: ["Depends on user agent"](https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/color) via `color` attribute.

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