Improved mobile view of the sites

We've improved the logic of the mobile view creation. Now the paddings and fonts adjust better on mobiles which makes the websites lighter, neater, and more readable. There is now more space around buttons, and if you entered bigger paddings on the desktop, they will enlarge proportionally on smaller screens.

Moreover, empty columns and collections don't display on mobiles anymore.

To view a new, better mobile version of your website, make sure to re-publish it.