Move notifications button to space drawer.

Since this means that the space drawer can no longer be hidden when there are no spaces,
also make it less empty by adding a button for creating new spaces.
More things will come in the future.

BUG: 479051

src/qml/RoomListPage.qml

@@ -129,24 +129,6 @@ Kirigami.Page {
 
                 topMargin: Math.round(Kirigami.Units.smallSpacing / 2)
 
-                KirigamiComponents.FloatingButton {
-                    icon.name: "notifications"
-                    text: i18n("View notifications")
-                    anchors.right: parent.right
-                    anchors.rightMargin: Kirigami.Units.largeSpacing
-                    anchors.bottom: parent.bottom
-                    anchors.bottomMargin: Kirigami.Units.largeSpacing
-                    width: Kirigami.Units.gridUnit * 2
-                    height: width
-                    visible: !root.collapsed
-                    QQC2.ToolTip.text: text
-                    QQC2.ToolTip.delay: Kirigami.Units.toolTipDelay
-                    QQC2.ToolTip.visible: hovered
-                    onClicked: pageStack.pushDialogLayer("qrc:/org/kde/neochat/qml/NotificationsView.qml", {connection: root.connection}, {
-                        title: i18nc("@title", "Notifications")
-                    });
-                }
-
                 header: QQC2.ItemDelegate {
                     width: visible ? ListView.view.width : 0
                     height: visible ? Kirigami.Units.gridUnit * 2 : 0