Implemented new dark theme

src/utils/migrations/settings/migration.ts

@@ -0,0 +1,13 @@
+import { SettingsV0 } from './v0'
+import { SettingsV1 } from './v1'
+
+const settingsMigration = {
+  1: (state: SettingsV0): SettingsV1 => {
+    return {
+      ...state,
+      darkTheme: 'lighter'
+    }
+  }
+}
+
+export default settingsMigration