[Update] Combine in one window. Rename Main/Config Window to Main/Config Page accordingly.

For now, I put Config Page to below the main page temporary. Open Config Button does not work.

src-ui/utils/variables.css

@@ -45,7 +45,7 @@
     --dark_1000_color: #151517;
 
 
-    --main_window_topbar_height: 4.8rem;
-    --config_window_sidebar_width: 22rem;
-    --config_window_topbar_height: 5.2rem;
+    --main_page_topbar_height: 4.8rem;
+    --config_page_sidebar_width: 22rem;
+    --config_page_topbar_height: 5.2rem;
 }