github icon dark-mode fix

src/pages/_includes/layout/navbar-side.html

@@ -5,7 +5,7 @@
 	{% unless include.condensed %}
 	<div class="nav-item d-none d-md-flex me-3">
 		<div class="btn-list">
-			{% include ui/button.html icon="brand-github" icon-color="github" outline=true text="Source code" href=site.github-url external=true %}
+			{% include ui/button.html icon="brand-github" outline=true text="Source code" href=site.github-url external=true %}
 			{% include ui/button.html icon="heart" icon-color="pink" outline=true text="Sponsor" href=site.github-sponsors-url external=true %}
 		</div>
 	</div>