integrate repl into astro website

+ update build and setup tasks + workflow
+ move repl test folder to root
+ move docs and repl to website/src

website/src/repl/prebake.mjs

@@ -0,0 +1,31 @@
+import { Pattern, toMidi, valueToMidi } from '@strudel.cycles/core';
+import { samples } from '@strudel.cycles/webaudio';
+
+export async function prebake({ baseDir = '.' } = {}) {
+  // https://archive.org/details/SalamanderGrandPianoV3
+  // License: CC-by http://creativecommons.org/licenses/by/3.0/ Author: Alexander Holm
+  return await Promise.all([
+    samples('piano.json', `${baseDir}/piano/`),
+    // https://github.com/sgossner/VCSL/
+    // https://api.github.com/repositories/126427031/contents/
+    // LICENSE: CC0 general-purpose
+    samples('vcsl.json', 'github:sgossner/VCSL/master/'),
+    samples('tidal-drum-machines.json', 'github:ritchse/tidal-drum-machines/main/machines/'),
+    samples('EmuSP12.json', `${baseDir}/EmuSP12/`),
+  ]);
+}
+
+const maxPan = toMidi('C8');
+const panwidth = (pan, width) => pan * width + (1 - width) / 2;
+
+Pattern.prototype.piano = function () {
+  return this.clip(1)
+    .s('piano')
+    .release(0.1)
+    .fmap((value) => {
+      const midi = valueToMidi(value);
+      // pan by pitch
+      const pan = panwidth(Math.min(Math.round(midi) / maxPan, 1), 0.5);
+      return { ...value, pan: (value.pan || 1) * pan };
+    });
+};