Improvements for dark mode (#322)

* Action colors are now determined based on theme

* Fix unused import

* Update some more colors based on theme

* Updated release notes

* Better color choice

* Update for home screen

* Updates for app drawer

* remove unused import

lib/widget/category_display.dart

@@ -151,7 +151,7 @@ class _CategoryDisplayState extends RefreshableState<CategoryDisplayWidget> {
               subtitle: Text("${widget.category?.parentPathString}"),
               leading: FaIcon(
                 FontAwesomeIcons.turnUp,
-                color: COLOR_CLICK,
+                color: COLOR_ACTION,
               ),
               onTap: () async {