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/traccar/Chart.yaml

@@ -8,7 +8,7 @@ keywords:
 - traccar
 - gps
 home: https://github.com/truecharts/apps/tree/master/charts/stable/traccar
-icon: https://truecharts.org/_static/img/appicons/traccar-icon.png
+icon: https://truecharts.org/_static/img/appicons/traccar.png
 sources:
 - https://github.com/traccar/traccar
 - https://hub.docker.com/r/traccar/traccar