Replace Global Menu

Remove the global menu and move explore and new chat/room buttons to new `ExploreComponent.qml`.

This is designed to sit in the header of the `RoomListPage` and will only be visible when the room list is. The other settings have just been removed as they are covered by the `UserInfo` component and quick can be done form the decoration or system tray.

When wide\
![image](/uploads/ae652b4beeae8cbde0def427fbc65112/image.png)

Collapsed mode\
![image](/uploads/0aac45d8fa1dd718afd764656dded76b/image.png)

src/qml/Page/RoomListPage.qml

@@ -115,8 +115,6 @@ Kirigami.ScrollablePage {
         }
     }
 
-    title: i18n("Rooms")
-
     property var enteredRoom
     property bool collapsedMode: Config.roomListPageWidth < applicationWindow().minPageWidth && applicationWindow().shouldUseSidebars
 
@@ -169,23 +167,10 @@ Kirigami.ScrollablePage {
         goToPreviousRoomFiltered((item) => (item.visible && item.hasUnread));
     }
 
-    titleDelegate: collapsedMode ? empty : searchField
-
-    Component {
-        id: empty
-        Item {}
-    }
-
-    Component {
-        id: searchField
-        Kirigami.SearchField {
-            Layout.topMargin: Kirigami.Units.smallSpacing
-            Layout.bottomMargin: Kirigami.Units.smallSpacing
-            Layout.fillHeight: true
-            Layout.fillWidth: true
-            onTextChanged: sortFilterRoomListModel.filterText = text
-            KeyNavigation.tab: listView
-        }
+    titleDelegate: ExploreComponent {
+        Layout.fillWidth: true
+        desiredWidth: page.width - Kirigami.Units.largeSpacing
+        collapsed: collapsedMode
     }
 
     ListView {