Merge docs css into main

Our CSS was split between `main.css` and `docs.css`, for legacy reasons.

This merges them together.

app/assets/sass/main.scss

@@ -4,6 +4,7 @@
 // Components that are not in the NHS.UK frontend library
 @import 'components/figure';
 @import 'components/code-snippet';
+@import 'components/header';
 
 @import 'styles/code';
 @import 'styles/highlight';
@@ -13,9 +14,32 @@
 // Add your custom CSS/Sass styles below...
 ///////////////////////////////////////////
 
+// Overrides auto reload div background colour
+#hc_extension_bkgnd {
+  background-color: $color_nhsuk-grey-4 !important;
+}
+
+
 // This is a temporary fix to remove the 'Home' link in
 // the primary navigation which is added Header primary nav.
 // Should be able to remove this after the next NHS Frontend update.
 .nhsuk-header__navigation-item--home {
   display: none;
 }
+
+// Installation guide screenshots
+.app-img-guide {
+  width: 100%;
+}
+
+// Table hotfix
+.nhsuk-table__body .nhsuk-table__cell {
+  vertical-align: top;
+}
+
+.nhsuk-table__header,
+.nhsuk-table__cell {
+  padding: 16px 16px 16px 0;
+}
+
+

app/views/layout.html

@@ -3,7 +3,6 @@
 
 {% block headCSS %}
   <link href="/css/main.css" rel="stylesheet">
-  <link href="/css/docs.css" rel="stylesheet">
 {% endblock %}
 
 {% block header %}