pinescript demo fix

Author: alaa-eddine

docs/indicators/cross-signal/index.html

@@ -7,10 +7,10 @@
 
         <script src="https://cdn.jsdelivr.net/npm/echarts/dist/echarts.min.js"></script>
         <!-- QFChart Library -->
-        <script src="../js/qfchart.min.browser.js"></script>
+        <script src="../../js/qfchart.min.browser.js"></script>
 
         <!-- Dependencies for Data Loading -->
-        <script src="../js/pinets.dev.browser.js"></script>
+        <script src="../../js/pinets.dev.browser.js"></script>
         <link rel="stylesheet" href="../styles.css" />
     </head>