List all pinned contentThis endpoint lists all contentResponses200OKSchema — OPTIONAL string400Bad RequestSchema — OPTIONALcode integer — OPTIONALdetails string — OPTIONALreason string — OPTIONAL500Internal Server ErrorSchema — OPTIONALcode integer — OPTIONALdetails string — OPTIONALreason string — OPTIONAL