Added sass, and initial sass partials

src/stylesheets/abstracts/_mixins.scss

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+@mixin on-event($self: false) {
+	@if $self {
+		&,
+		&:hover,
+		&:active,
+		&:focus {
+			@content;
+		}
+	} @else {
+		&:hover,
+		&:active,
+		&:focus {
+			@content;
+		}
+	}
+}
+

src/stylesheets/abstracts/_variables.scss

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+// Font stacks
+$text-font-stack: 'Roboto', 'Arial', sans-serif !default;
+
+// Colours
+$text-colour: rgb(34, 34, 34) !default;

src/stylesheets/base/_typography.scss

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+body {
+	font-family: $text-font-stack;
+	color: $text-colour;
+}

src/stylesheets/main.scss

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+@import 'abstracts/variables';
+@import 'abstracts/mixins';
+
+@import 'base/typography';