Add JS sections

examples/main.chsp

@@ -1,5 +1,4 @@
 // comment lmao
-/* a confusing comment */
 egg notepad
 init {
     sendMessage "Hello there!"
@@ -7,6 +6,9 @@ init {
         <textarea id="dingus">
     }
     log "egg initialised"
+    js {
+        alert("this is an alert! i repeat - this is an alert!");    
+    }
 }
 
 onRecieving egg * * {