Optimise CSS (#17)

* Installs Sass

* installs concurrently

* Ports CSS to SCSS

* Gitignores CSS build output

* Moves public/main.css to scss/index.scss

* Fixes port to SCSS

* Use-ifies base styles

* Use-ifies layout styles

* Use-ifies modules styles

* Use-ifies variables

* Use-ifies utils

* Moves normalize to scss

* Implements a CSS minifying step with CSSO

---------

Co-authored-by: Joe Carstairs <jcarstairs@scottlogic.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/scss/layout/grid.scss b/scss/layout/grid.scss
new file mode 100644
index 0000000..25cdd95
--- /dev/null
+++ b/scss/layout/grid.scss
@@ -0,0 +1,30 @@
+:is(
+  header,
+  footer,
+  nav,
+  :is(main, article) > section:not(:is(section, header) :is(section, header))
+):not(.section--full-width) {
+  padding-inline: calc(var(--grid-padding) + 0.5 * (100vw - var(--grid-total-width)));
+}
+
+.grid-span-1 {
+  width: var(--grid-column-width);
+}
+
+/* On screens narrower than 16rem, there is only one column. */
+
+.grid-span-2 {
+  width: var(--grid-column-width);
+}
+
+.grid-span-3 {
+  width: var(--grid-column-width);
+}
+
+.width-prose {
+  width: var(--prose-width);
+}
+
+.grid-span-full {
+  width: var(--grid-total-width);
+}