changed the canvas placeholder to fit flot

frontend/index.html

@@ -18,7 +18,7 @@
     <p id="debug">
     </p>
     <h3>Spectrogram</h3>
-    <canvas id="spectrogram" width="640px" height="480"></canvas>
+    <div id="graph"></div>
     <h3>Spectral readings</h3>
     <table class="table table-dark table-sm" id="specter">
       <thead class="thead-dark">
@@ -148,7 +148,8 @@
   </div>
   <script src="lib/bootstrap.bundle.min.js"></script>
   <script src="lib/jquery-3.4.1.min.js"></script>
-  <script src="lib/chart.bundle.js"></script>
+  <script src="lib/flot/jquery.flot.js"></script>
   <script src="frontend.js"></script>
 </body>
+
 </html>