feat: Remove direct file dependency of mermaid from elk, by using peerDependency.

packages/mermaid-layout-elk/src/layouts.ts

@@ -0,0 +1,17 @@
+import type { LayoutLoaderDefinition } from 'mermaid';
+
+const loader = async () => await import(`./render.js`);
+const algos = ['elk.stress', 'elk.force', 'elk.mrtree', 'elk.sporeOverlap'];
+
+export const layouts: LayoutLoaderDefinition[] = [
+  {
+    name: 'elk',
+    loader,
+    algorithm: 'elk.layered',
+  },
+  ...algos.map((algo) => ({
+    name: algo,
+    loader,
+    algorithm: algo,
+  })),
+];