Allow Parent Stores for differenct Countries

A store should have parentIds.

E.g. DM;"";False; DM Österreich;"https://www.dm.at";False; DM Deutschland;"https://www.dm.de";False;

The API should also automatically return Childs in an array.

{
   name: "DM",
   baseUrl: "",
   children: [
      {
         name: "DM Deutschland",
         baseUrl: "https://www.dm.de"
      },
      {
         name: "DM Österreich",
         baseUrl: "https://www.dm.at"
      }
   ]
}

If a store has children, it should not be clickable anymore. However, there needs to be a an "Overview" Button additionally to all of the children, where you can see the price differences between the same products (articleNumber), ordered by the amount of difference.

Zumpel96 / Teuerungsportal

Allow Parent Stores for differenct Countries #146