The division operator `/` from Sass is deprecated because `/` is used in
CSS for uses other than dividing numbers. That's why we were getting
many warnings like:
```
Deprecation Warning: Using / for division outside of calc() is
deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($line-height, 2) or calc($line-height / 2)
More info and automated migrator: https://sass-lang.com/d/slash-div
margin-top: $line-height / 2;
```
Since using math.div makes the code harder to read and `calc` is
universally supported by all browsers (although the implementation in
Internet Explorer doesn't work in certain cases), we're using `calc`
when assigning the value to a CSS property.
However, we're also using divisions when assigning Sass variables, and
in those cases using `calc` is trickier because sometimes these
variables are used in other operations. We'll handle these cases in the
next commit.
They were all following the same format.
Note we need to group the `see_all` translation keys together (the same
way it's done with the `most_active` keys) so we don't have an unused
translation warning.
We're also moving the "see all" link in processes outside the feed
content; the same way it's done in debates and proposals and removing
unnecessary classes in the processes feed: the column class is causing
the processes not to be aligned with the debates above them, and the
margin bottom is not needed because the margin of the footer is already
enough.
