add removing config by key

html/src/repository/shared.js

@@ -1,6 +1,10 @@
 // requires binding of SharedVariable
 
 class SharedRepository {
+    remove(key) {
+        key = transformKey(key);
+        return SharedVariable.Remove(key);
+    }
     getString(key, defaultValue = null) {
         key = transformKey(key);
         var value = SharedVariable.Get(key);