Fix: (img.first-column-layout) Invert "Array libraries" logos

This is a simple way to make them "presentable" in dark mode.
Otherwise, we'd need to keep their backgrounds white (which would
clash with the dark background), or edit each one individually and
swap them for dark mode, which would be more complicated.

assets/css/tabs.scss

@@ -133,6 +133,10 @@ img.first-column-layout {
     max-width: 100px;
     max-height: 30px;
     margin: 0px 20px 0px 10px;
+
+    html[data-theme=dark] & {
+        filter: invert(1) !important;
+    }
 }
 
 td.left-text {