Added the advanced settings page

- added a button to scan the server for installed containers
- added a check on the presence of installed containers before configuring the server, if the containers are already installed, then we will add them to the GUI
- added new control element - PopupWarning.qml

client/ui/qml/Controls/PopupWarning.qml

@@ -0,0 +1,34 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+
+Popup {
+    id: root
+
+    property string popupWarningText
+
+    anchors.centerIn: Overlay.overlay
+    modal: true
+    closePolicy: Popup.NoAutoClose
+    width: parent.width - 20
+
+    ColumnLayout {
+        width: parent.width
+        Text {
+            horizontalAlignment: Text.AlignHCenter
+            Layout.fillWidth: true
+            wrapMode: Text.WordWrap
+            font.pixelSize: 16
+            text: root.popupWarningText
+        }
+
+        BlueButtonType {
+            Layout.preferredWidth: parent.width / 2
+            Layout.fillWidth: true
+            text: "Continue"
+            onClicked: {
+                root.close()
+            }
+        }
+    }
+}