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/ghost/Chart.yaml

@@ -10,7 +10,7 @@ dependencies:
   version: 2.0.0
 description: Ghost is an open source, professional publishing platform built on a modern Node.js technology stack — designed for teams who need power, flexibility and performance.
 home: https://github.com/truecharts/apps/tree/master/charts/stable/ghost
-icon: https://truecharts.org/_static/img/appicons/ghost-icon.png
+icon: https://truecharts.org/_static/img/appicons/ghost.png
 keywords:
 - ghost
 - blog