chore: final code re-organization after the css refactoring

src/styles/_mixins.css

@@ -1,4 +1,6 @@
-@mixin neo-brutalist-card($size: 3px, $offset: $size + 1, $shadow: true, $hoverable: false) {
+/* This file is here for historical reasons but is not used anymore */
+
+/* @mixin neo-brutalist-card($size: 3px, $offset: $size + 1, $shadow: true, $hoverable: false) {
     border: $size solid #222;
     border-radius: $size * 2;
 
@@ -14,4 +16,4 @@
             box-shadow: $offset + 1 $offset + 1 0 0 #222;
         }
     }
-}
+} */

src/styles/_pages.css

@@ -1,3 +1,5 @@
+/* This file is here for historical reasons but is not used anymore */
+
 @layer page {
     /* 
     .login {