1. improved submit button toggle case wrt checkbox value

2. send checkbox value instead of a hardcoded value

app/static/scripts/function.js

-var check_counter =0;
 function check() { 
   var submitButton = document.getElementById("submit");
-  if ((check_counter+=1)%2) submitButton.disabled = false;
-  else submitButton.disabled = true;
+  let ckbox = document.getElementById('agree');
+  submitButton.disabled = !ckbox.checked;
 };
 
 function displayloading1() {
@@ -20,7 +19,7 @@ function request_account() {
         email: document.getElementById("email").value,
         reason: document.getElementById("reason").value,
         username: document.getElementById("username").value,
-        aup: 1
+        aup: document.getElementById("agree").checked
     })
 }