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/podgrab/Chart.yaml

@@ -8,7 +8,7 @@ deprecated: false
 description: A self-hosted podcast manager to download episodes as soon as they become
   live.
 home: https://github.com/truecharts/apps/tree/master/charts/stable/podgrab
-icon: https://truecharts.org/_static/img/appicons/podgrab-icon.png
+icon: https://truecharts.org/_static/img/appicons/podgrab.png
 keywords:
 - podgrab
 kubeVersion: '>=1.16.0-0'