fix: remove remaining reference to Titillium webfont (via #4840)

Follow up to #4598

src/style/_layout.scss

@@ -648,7 +648,7 @@
   text-align: center;
   padding: 5px;
   border-radius: 4px;
-  font-family: 'Titillium Web', sans-serif;
+  font-family: sans-serif;
   font-weight: 600;
   color: white;
   font-size: 14px;