Add modern-normalize and move Scss to its own directory.

package.json

@@ -1,5 +1,8 @@
 {
   "type": "module",
+  "dependencies": {
+    "modern-normalize": "^2.0.0"
+  },
   "devDependencies": {
     "@bauke/eslint-config": "^0.1.5",
     "@bauke/prettier-config": "^0.1.5",

source/layouts/base.astro

@@ -1,5 +1,6 @@
 ---
-import "./base.scss";
+import "modern-normalize/modern-normalize.css";
+import "../scss/base.scss";
 
 /** Properties for the base layout. */
 export interface Props {