Refactor/app shell#92

fulleni merged 26 commits intomainflutter-news-app-full-source-code/flutter-news-app-web-dashboard-full-source-code:mainfrom

refactor/app-shellflutter-news-app-full-source-code/flutter-news-app-web-dashboard-full-source-code:refactor/app-shellCopy head branch name to clipboard