re #58 fixed (nav.js, app.css)
re #58 frontend part refactored
re #58 mostly css edited, also login/logout
re #58 Rewrited client app to React #58 // yoso internal app // in progress #60 // fixed
re #58 conected to correct server, added config.json, added credentials in api.js and relocated errors 401, 403 to home page instead of throwing alert, edited login, edit link navbar logo
re #58 css responsive
re #58 Refactoring, every fetch moved to api.js
re #58 first version of react app