Light mode (#38)

public/hljs.scss

@@ -0,0 +1,9 @@
+:root {
+    @import "github-markdown-css/github-markdown-light";
+    @import 'highlight.js/scss/base16/one-light.scss';
+}
+
+.dark {
+    @import "github-markdown-css/github-markdown-dark";
+    @import 'highlight.js/scss/base16/onedark.scss';
+}