feat: subtler footer background

Author: fizzyizzy05

sass/_footer.scss

@@ -5,15 +5,15 @@
 @media (prefers-color-scheme: light) {
     footer {
         background: #{
-            color.adjust($light-background-colour, $lightness: -7.5%)
+            color.adjust($light-background-colour, $lightness: -3.75%)
         };
     }
 }
 
 @media (prefers-color-scheme: dark) {
     footer {
         background: #{
-            color.adjust($dark-background-colour, $lightness: 2.5%)
+            color.adjust($dark-background-colour, $lightness: 2%)
         };
     }
 }