Remove renderWebsocketOutput and use printWebsocketOutput instead

* The `render` command is not used much
* Originally added with commit 898074be3f
* The `#render` anchor (see findOrCreateRenderElement) was the "Render" button above the editor, nothing was rendered at all if executing code and otherwise it would be included _within_ the button.

app/assets/javascripts/editor/editor.js.erb

@@ -84,16 +84,6 @@ var CodeOceanEditor = {
         }
     },
 
-    findOrCreateRenderElement: function (index) {
-        if ($('#render-' + index).isPresent()) {
-            return $('#render-' + index);
-        } else {
-            var element = $('<div>').attr('id', 'render-' + index);
-            $('#render').append(element);
-            return element;
-        }
-    },
-
     getCardClass: function (result) {
         if (result.file_role === 'teacher_defined_linter') {
             return 'card bg-info text-white'

app/assets/javascripts/editor/evaluation.js

@@ -174,11 +174,6 @@ CodeOceanEditorEvaluation = {
     /**
      * Output-Logic
      */
-    renderWebsocketOutput: function (msg) {
-        var element = this.findOrCreateRenderElement(0);
-        element.append(msg.data);
-    },
-
     printWebsocketOutput: function (msg) {
         if (!msg.data || msg.data === "\r") {
             return;

app/assets/javascripts/editor/execution.js

@@ -44,7 +44,7 @@ CodeOceanEditorWebsocket = {
     this.websocket.on('clear', this.clearOutput.bind(this));
     this.websocket.on('turtle', this.handleTurtleCommand.bind(this));
     this.websocket.on('turtlebatch', this.handleTurtlebatchCommand.bind(this));
-    this.websocket.on('render', this.renderWebsocketOutput.bind(this));
+    this.websocket.on('render', this.printWebsocketOutput.bind(this));
     this.websocket.on('exit', this.handleExitCommand.bind(this));
     this.websocket.on('status', this.showStatus.bind(this));
     this.websocket.on('hint', this.showHint.bind(this));