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/onlyoffice-document-server/Chart.yaml

@@ -17,7 +17,7 @@ description: 'ONLYOFFICE Document Server is an online office suite comprising vi
   Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real
   time.'
 home: https://github.com/truecharts/apps/tree/master/charts/stable/onlyoffice-document-server
-icon: https://truecharts.org/_static/img/appicons/onlyoffice-document-server-icon.png
+icon: https://truecharts.org/_static/img/appicons/onlyoffice-document-server.png
 keywords:
 - onlyoffice
 kubeVersion: '>=1.16.0-0'