Improves application's UI being more responsive and intuitive

During development the application's responsive nature (it working on tablets and phones too) got a bit left bind. Therefore, this pull-requests deals with changes and improving a few UI related things. 

- [x] Change Layout of flags
- [x] Dishes view and font alignment
- [x] Fixes the big star
- [x] Scroll to top button

@anna-averianova, @danidanone17, @konstantinos-chronis, @Guido46 feel free to note and add everything UI related you find in the app which bothers you!

Close #73