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/n8n/Chart.yaml

@@ -14,7 +14,7 @@ dependencies:
   version: 2.0.0
 description: n8n is an extendable workflow automation tool.
 home: https://github.com/truecharts/apps/tree/master/charts/stable/n8n
-icon: https://truecharts.org/_static/img/appicons/n8n-icon.png
+icon: https://truecharts.org/_static/img/appicons/n8n.png
 keywords:
 - workflows
 - automation