Fix p tags

Author: paulsimonandrews

client/sass/application.scss

@@ -4,9 +4,13 @@ $govuk-images-path: '#{$govuk-assets-path}images/';
 $govuk-fonts-path: '#{$govuk-assets-path}fonts/';
 $govuk-global-styles: true;
 
-@use 'govuk-frontend/dist/govuk/all.scss';
+@use 'govuk-frontend/dist/govuk/index.scss';
 @use 'govuk-frontend/dist/govuk/settings/colours-applied.scss';
 
+p {
+  @extend %govuk-body-m;
+}
+
 // Add extra styles here
 .contact {
   border-left: 1px solid #b1b4b6;