fix: remove inline script and improve noscript message

Refactored inline exchangeRates script to main.js for better practice and maintainability. Enhanced the noscript warning message's readability by replacing paragraph tags with line breaks, ensuring clearer instructions for users without JavaScript.

index.php

@@ -196,8 +196,8 @@ foreach (array_reverse($preferred_currencies) as $currency) {
 
                 <noscript>
                     <div class="alert alert-warning" role="alert">
-                        <p>Looks like you have JavaScript disabled. You can still use this tool, but you won't be able to use the &#128203; buttons to automatically copy the results to your clipboard.</p>
-                        <p>Use the &darr; button to convert XMR to fiat, or the &uarr; button to convert fiat to XMR.</p>
+                        Looks like you have JavaScript disabled. You can still use this tool, but you won't be able to use the &#128203; buttons to automatically copy the results to your clipboard.<br />
+                        Use the &darr; button to convert XMR to fiat, or the &uarr; button to convert fiat to XMR.
                     </div>
                 </noscript>
 
@@ -229,9 +229,6 @@ foreach (array_reverse($preferred_currencies) as $currency) {
         </div>
     </div>
 
-    <script>
-        var exchangeRates = <?php echo json_encode($exchangeRates); ?>;
-    </script>
     <script src="js/main.js"></script>
 </body>
 

src/js/main.js

@@ -14,6 +14,8 @@ console.log(tooltipList);
 
 let lastModifiedField = 'xmr';
 
+var exchangeRates = {};
+
 document.addEventListener('DOMContentLoaded', function () {
   const copyXMRBtn = document.getElementById('copyXMRBtn');
   const copyFiatBtn = document.getElementById('copyFiatBtn');