Remove barChartSample8, we combined it with barChartSample6

Author: imaNNeo

repo_files/documentations/bar_chart.md

@@ -158,8 +158,5 @@ enum values {`start`, `end`, `center`, `spaceEvenly`, `spaceAround`, `spaceBetwe
 ##### Sample 7 ([Source Code](/example/lib/presentation/samples/bar/bar_chart_sample7.dart))
 <img src="https://github.com/imaNNeo/fl_chart/raw/master/repo_files/images/bar_chart/bar_chart_sample_7.gif" width="300" >
 
-##### Sample 8 ([Source Code](/example/lib/presentation/samples/bar/bar_chart_sample8.dart))
-<img src="https://github.com/imaNNeo/fl_chart/raw/master/repo_files/images/bar_chart/bar_chart_sample_8.png" width="300" >
-
 ##### Gist - Toggleable Tooltip ([Source Code](https://gist.github.com/imaNNeo/bce3f0169ff3fd6c3f137cdeb5005c0e))
 https://user-images.githubusercontent.com/7009300/156784816-53f95dd9-f387-4600-8a92-d05b1aeea3da.mov