refactor(app): folder structure, components cleanup

src/components/Edges/StepEdge.js

@@ -0,0 +1,17 @@
+import React, { memo } from 'react';
+
+export default memo((props) => {
+  const {
+    sourceX, sourceY, targetX, targetY, style = {}
+  } = props;
+
+  const yOffset = Math.abs(targetY - sourceY) / 2;
+  const centerY = targetY < sourceY ? targetY + yOffset : targetY - yOffset;
+
+  return (
+    <path
+      {...style}
+      d={`M ${sourceX},${sourceY}L ${sourceX},${centerY}L ${targetX},${centerY}L ${targetX},${targetY}`}
+    />
+  );
+});