chore(docs): Remove -icon string from icon png's (#2040)

* rename icons (remove `-icon`)

* Remove (`-icon`) from chart.yaml

* Add 2 icons

* slight format change

* remove -icon

charts/stable/minio/Chart.yaml

@@ -6,7 +6,7 @@ dependencies:
   version: 9.0.0
 description: Minio is a self-hosted S3 storage server
 home: https://github.com/truecharts/apps/tree/master/charts/stable/minio
-icon: https://truecharts.org/_static/img/appicons/minio-icon.png
+icon: https://truecharts.org/_static/img/appicons/minio.png
 keywords:
 - minio
 - s3