feat: add a white theme

tailwind.config.js

@@ -1,5 +1,6 @@
 /** @type {import('tailwindcss').Config} */
 module.exports = {
+  darkMode: "class",
   content: [
     "./app/**/*.{ts,tsx}",
     "./components/**/*.{ts,tsx}",
@@ -14,6 +15,12 @@ module.exports = {
         "wy-border": "#30363d",
         "wy-text-primary": "#c9d1d9",
         "wy-text-secondary": "#8b949e",
+        // Light theme
+        "wy-light-bg": "#f0f6ff",
+        "wy-light-surface": "#ffffff",
+        "wy-light-border": "#d0d7de",
+        "wy-light-text-primary": "#1c2128",
+        "wy-light-text-secondary": "#57606a",
       },
     },
   },