set up tailwindcss

installer-gui/src/app.css

@@ -0,0 +1,7 @@
+@import 'tailwindcss';
+
+@theme {
+    --color-rayhunter-blue: #4e4eb1;
+    --color-rayhunter-dark-blue: #3f3da0;
+    --color-rayhunter-green: #94ea18;
+}

installer-gui/src/routes/+layout.svelte

@@ -0,0 +1,6 @@
+<script>
+    import '../app.css';
+    let { children } = $props();
+</script>
+
+{@render children()}