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/synapse/Chart.yaml

@@ -11,7 +11,7 @@ dependencies:
 deprecated: false
 description: A Helm chart to deploy a Matrix homeserver stack into Kubernetes
 home: https://github.com/truecharts/apps/charts/stable/synapse
-icon: https://truecharts.org/_static/img/appicons/synapse-icon.png
+icon: https://truecharts.org/_static/img/appicons/synapse.png
 keywords:
 - chat
 - matrix