doc: split accumulation and conditions

website/src/pages/learn/accumulation.mdx

@@ -0,0 +1,30 @@
+---
+title: Accumulation Modifiers
+description: Strudel Tutorial - Coding syntax
+layout: ../../layouts/MainLayout.astro
+---
+
+import { MiniRepl } from '../../docs/MiniRepl';
+import { JsDoc } from '../../docs/JsDoc';
+
+# Accumulation Modifiers
+
+## superimpose
+
+<JsDoc client:idle name="Pattern.superimpose" h={0} />
+
+## layer
+
+<JsDoc client:idle name="Pattern.layer" h={0} />
+
+## off
+
+<JsDoc client:idle name="Pattern.off" h={0} />
+
+## echo
+
+<JsDoc client:idle name="Pattern.echo" h={0} />
+
+## echoWith
+
+<JsDoc client:idle name="Pattern.echoWith" h={0} />