TODO:

1. Fix design in forms (gaps).
2. All functions in
   utils
   folder must be async, must not use promises.
3. defaultOptions
   must be used only in
   tokens.js
   file in
   request
   function only. Now in
   getUser
   request is not configured properly
   Content-Type
   Header.
4. For
   accessToken
   must be used cookies.
5. It is needed to add function
   isTokenExists
   in
   token.js
   for checking existing of access token in cookies. This function must be used in
   checkUserAuth
   action.
6. checkUserAuth
   must be async without promises.