add referece to main in stores and clean main contents

pyscriptjs/src/Main.svelte

@@ -2,24 +2,31 @@
     import Fa from 'svelte-fa';
     import { faWandMagic, faPlusCircle, faInfoCircle } from '@fortawesome/free-solid-svg-icons'
     import SideNav from "./SideNav.svelte";
+    import { onMount } from 'svelte';
+
+    import { mainDiv } from './stores';
+
+    // reference to the main application div
+    let main;
+    onMount(() => {
+      // set the mainDiv in stores to point to the main div, after it has been mounted
+      mainDiv.set(main);
+    });
 
 </script>
 
 <div class="flex content-between flex-wrap min-h-full flex-grow">
-  <main class="w-full p-6">
+  <main class="w-full p-6" bind:this={main}>
     <div role="alert" class="w-full p-2 rounded-full bg-teal-light text-teal-darker text-lg">
-      <py-script auto-generate target="page:mydiv" source='./mycode.py'>
-          sum([1, 2, 3, 4, 5])
-        </py-script>
     </div>
   </main>
 
   <footer class="w-full p-6 bg-black text-white flex space-between">
       <p class="logo-title text-center">PyScript</p>
-      <p class="w-full ml-6 text-center sm:text-left">Copyright &copy; 2019</p>
+      <p class="w-full ml-6 text-center sm:text-left">Copyright &copy; 2022</p>
 
         <aside class="w-full sm:w-auto text-center sm:text-right">
-          <a href="https://github.com/SlawomirChabowski" title="My Github page" class="text-white block">
+          <a href="https://pyscript.com" title="PyScript" class="text-white block">
               <Fa icon={faInfoCircle} style="transform: scale(2);"/>
           </a>
         </aside>