get rid of animations on theme switcher

src/components/ThemeSwitcher.astro

@@ -38,26 +38,15 @@ button {
     }
 
     /* hide by default, i.e. if JS isn't enabled and the data-theme attribute didn't get set, */
-    visibility: hidden;
-    opacity: 0;
-    transition:
-        color 0.2s ease,
-        opacity 0.5s ease,
-        transform 0.5s ease;
+    display: none;
 }
 
 :global(html[data-theme="light"]) button#switch-to-dark {
-    opacity: 1;
-    visibility: visible;
-    transform: rotate(360deg);
-    /* whichever one is currently active should be on top */
-    z-index: 10;
+    display: block;
 }
+
 :global(html[data-theme="dark"]) button#switch-to-light {
-    opacity: 1;
-    visibility: visible;
-    transform: rotate(-360deg);
-    z-index: 10;
+    display: block;
 }
 </style>