feat(design): update doc viewer menu button colors (#3023)

Author: xelaint

apps/daffio/src/app/docs/components/doc-viewer/doc-viewer.component.scss

@@ -47,10 +47,11 @@
 		gap: 8px;
 		align-items: center;
 		justify-content: center;
-		background: white;
+		background: var(--daff-theme);
 		border: 0;
 		border-top: 1px solid rgb(var(--daff-theme-contrast-rgb), 0.1);
 		border-bottom: 1px solid rgb(var(--daff-theme-contrast-rgb), 0.1);
+		color: var(--daff-theme-contrast);
 		overflow: auto;
 		padding: 16px 24px;
 		position: sticky;