feat: Prevent users from starting levels that they did not reach yet

frontend/src/containers/LevelList.ts

@@ -1,6 +1,8 @@
 import { connect } from "react-redux";
 
-import { setLevelListLoading, setLevels } from "../actions";
+import {
+    setLevelListLoading, setLevels, setLevelListSnackbar
+} from "../actions";
 
 import { ILevel } from "../models/level";
 
@@ -11,12 +13,14 @@ const mapStateToProps = state => {
         levels: state.levels,
         loading: state.levelList.loading,
         user: state.user,
+        snackbar: state.levelList.snackbar,
     };
 };
 const mapDispatchToProps = dispatch => {
     return {
         setLoading: (state: boolean) => dispatch(setLevelListLoading(state)),
         setLevels: (levels: ILevel[]) => dispatch(setLevels(levels)),
+        setSnackbar: (state: boolean) => dispatch(setLevelListSnackbar(state)),
     };
 };