refactor: remove await before samples calls in docs etc..

+ remove /master from dirt-samples calls (there is now a main branch)
+ remove /main endings from some places

examples/headless-repl/index.html

@@ -15,7 +15,7 @@
     <script type="module">
       import { initStrudel } from '@strudel/web';
       initStrudel({
-        prebake: () => samples('github:tidalcycles/Dirt-Samples/master'),
+        prebake: () => samples('github:tidalcycles/dirt-samples'),
       });
 
       const click = (id, action) => document.getElementById(id).addEventListener('click', action);