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/shiori/Chart.yaml

@@ -6,7 +6,7 @@ name: shiori
 description: A simple bookmark manager built with Go
 type: application
 home: "https://github.com/truecharts/apps/tree/main/charts/shiori"
-icon: https://truecharts.org/_static/img/appicons/shiori-icon.png
+icon: https://truecharts.org/_static/img/appicons/shiori.png
 keywords:
   - shiori
   - bookmark