Resolve "Improve / clean some code"

Closes #56 (closed)

lib/ui/widgets/abstracts/custom_chart.dart

@@ -3,7 +3,6 @@ import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
 
 import 'package:scrobbles/config/app_colors.dart';
-import 'package:scrobbles/utils/color_extensions.dart';
 
 class CustomChart extends StatelessWidget {
   const CustomChart({super.key});