Add Docker, rewrite design to MUI, add autotests

I've done a huge refactoring and rethinking of the code, I've added such a wonderful thing as Docker to the project! Also, I wrote autotests for most of the applications, the entire design of the React client part was rewritten on MUI, the ability for the user to choose a birthday and a city was added, the registration part was completely completed, the client part code also underwent refactoring and rethinking, Docker gave us the opportunity to use PostgreSQL as a database, and as a backend for caching - Redis.

The next step will be the implementation of the login for the client part, then we will completely pass the authentication stage, and proceed to the development of the feed for the client part. Follow the news.