hand written css refactor (only apply grayscale to past shows)

Author: csquared

index.html

@@ -160,6 +160,9 @@
                 aspect-ratio: 1;
                 object-fit: cover;
                 display: block;
+            }
+
+            #past-shows .show-card img {
                 filter: grayscale(100%);
             }
 
@@ -658,7 +661,7 @@ <h2 class="section-header">UPCOMING</h2>
             </div>
 
             <h2 class="section-header past-header">PAST SHOWS</h2>
-            <div class="shows-grid">
+            <div id="past-shows" class="shows-grid">
                 <a href="shows/2026-03-07/" class="show-card">
                     <img
                         src="assets/photos/stardust-everyone-behind-decks-2.jpg"