remove broken disk graphs

src/views/app.html

@@ -830,8 +830,6 @@
             </div>
             <label style="margin-top: 10px;">Memory (RAM + Swap) in MB</label>
             <canvas id="graphsMemoryChart" style="width: 100%;"></canvas>
-            <label>Disk Usage in MB <span class="text-muted"> - Data is only collected twice a day</span></label>
-            <canvas id="graphsDiskChart" style="width: 100%;"></canvas>
           </div>
         </div>
       </div>

src/views/app.js

@@ -669,15 +669,13 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
             }
 
             var memoryQuery = 'summarize(sum(collectd.localhost.table-' + appId + '-memory.gauge-rss, collectd.localhost.table-' + appId + '-memory.gauge-swap), "' + timeBucketSize + 'min", "avg")';
-            var diskQuery = 'summarize(collectd.localhost.du-' + appId + '.capacity-usage, "' + timeBucketSize + 'min", "avg")';
 
-            Client.graphs([ memoryQuery, diskQuery ], '-' + timePeriod + 'min', {}, function (error, result) {
+            Client.graphs([ memoryQuery ], '-' + timePeriod + 'min', {}, function (error, result) {
                 if (error) return console.error(error);
 
                 var currentMemoryLimit = $scope.app.memoryLimit || $scope.app.manifest.memoryLimit || (256 * 1024 * 1024);
 
                 fillGraph('#graphsMemoryChart', result[0], 'Memory', 'memoryChart', currentMemoryLimit / 1024 / 1024);
-                fillGraph('#graphsDiskChart', result[1], 'Disk', 'diskChart');
             });
         }
     };