Removed old menu entries for pages that don't exist anymore

src/yuzu/main.h

@@ -333,10 +333,6 @@ private slots:
     void OnPauseContinueGame();
     void OnStopGame();
     void OnPrepareForSleep(bool prepare_sleep);
-    void OnMenuReportCompatibility();
-    void OnOpenModsPage();
-    void OnOpenQuickstartGuide();
-    void OnOpenFAQ();
     void OnOpenMirrorRepo();
     /// Called whenever a user selects a game in the game list widget.
     void OnGameListLoadFile(QString game_path, u64 program_id);