style(light-theme): convert entire website into grayscale mode

Author: eric15342335

src/app/globals.css

@@ -120,6 +120,9 @@
 }
 
 @layer base {
+  html:not(.dark) {
+    filter: grayscale(100%);
+  }
   body {
     @apply bg-background text-foreground flex flex-col min-h-screen text-base transition-colors duration-300;
   }