Add new command; update kit command

A new command /kitinfo has been added to provide information about kits / perks at any time. The command /kit now also works in invincibility for players without kits. Sounds when picking up items has been removed

src/main/resources/plugin.yml

@@ -41,4 +41,8 @@ commands:
     permission: speedhg.admin.ranking
   perks:
     description: 'Perk-Auswahl öffnen'
-    usage: '/perks'
+    usage: '/perks'
+  kitinfo:
+    description: 'Shows the name and description of a kit or perk'
+    usage: '/kitinfo <name>'
+    aliases: [ perkinfo ]