some fixes

Author: GoodDayForSurf

.github/workflows/check-nextjs.yml

@@ -49,7 +49,7 @@ jobs:
           cd test-nextjs-app
           npm add devextreme-cli
           rm -r ./node_modules/devextreme-cli/src/
-          cp -r ../packages/devextreme-cli/src/ ./node_modules\devextreme-cli/
+          cp -r ../packages/devextreme-cli/src/ ./node_modules/devextreme-cli/
           ls ./node_modules/devextreme-cli
           ls ./node_modules/devextreme-cli/src
         shell: bash