Disable failing stylelint rules

We cannot fix the Stylint error by using the new CSS media query
range syntax, as we will get a new error when trying to compile the CSS.
The reason for this is that we use the sassc-rails gem to compile our CSS,
this includes the deprecated LibSass library which does not understand the
new CSS media query range syntax.

This can be fixed either by:

- Disabling the failing stylelint rules
// stylelint-disable-line foo

- Moving to DartSass (Not immediate)
Trello card - https://trello.com/c/4OgdZ7Yi/2145-spike-into-upgrading-to-dart-sass

app/assets/stylesheets/modules/_page-contents.scss

@@ -3,7 +3,7 @@
     margin-left: govuk-spacing(0);
     padding-right: govuk-spacing(3);
 
-    &:before {
+    &::before {
       content: "– ";
       display: inline-block;
       padding-right: govuk-spacing(1);

app/assets/stylesheets/views/_worldwide-organisation.scss

@@ -65,12 +65,12 @@
   }
 
   li {
-    @media (min-width: 1px) { // target modern browsers
+    @media (min-width: 1px) { // stylelint-disable-line media-feature-range-notation
       list-style: none;
       padding-left: $govuk-gutter-half;
       @include govuk-responsive-padding(1, "top");
 
-      &:before {
+      &:before { // stylelint-disable-line selector-pseudo-element-colon-notation
         content: "-";
         position: relative;
         float: left;