Add num samples from 0 up to 20 (#1310)

* re-edited numbers
* num samples up to 20
* add freesound license

Author: yaxu

website/src/repl/prebake.mjs

@@ -116,15 +116,27 @@ export async function prebake() {
           'numbers/8.wav',
         ],
         num: [
-          'num/0.wav',
-          'num/1.wav',
-          'num/2.wav',
-          'num/3.wav',
-          'num/4.wav',
-          'num/5.wav',
-          'num/6.wav',
-          'num/7.wav',
-          'num/8.wav',
+          'num/00.wav',
+          'num/01.wav',
+          'num/02.wav',
+          'num/03.wav',
+          'num/04.wav',
+          'num/05.wav',
+          'num/06.wav',
+          'num/07.wav',
+          'num/08.wav',
+          'num/09.wav',
+          'num/10.wav',
+          'num/11.wav',
+          'num/12.wav',
+          'num/13.wav',
+          'num/14.wav',
+          'num/15.wav',
+          'num/16.wav',
+          'num/17.wav',
+          'num/18.wav',
+          'num/19.wav',
+          'num/20.wav',
         ],
       },
       'github:tidalcycles/dirt-samples',