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/quassel-core/Chart.yaml

@@ -7,7 +7,7 @@ description: Quassel-core is a modern, cross-platform, distributed IRC client.
 type: application
 deprecated: false
 home: https://github.com/truecharts/apps/tree/master/charts/stable/quassel-core
-icon: https://truecharts.org/_static/img/appicons/quassel-core-icon.png
+icon: https://truecharts.org/_static/img/appicons/quassel-core.png
 keywords:
   - quassel-core
 sources: