Use SVG icons for UI buttons

server/public/styles.css

@@ -75,6 +75,18 @@
   width: 22px;
 }
 
+.u-nav .ui-icon {
+  display: block;
+  fill: none;
+  height: 15px;
+  pointer-events: none;
+  stroke: currentColor;
+  stroke-linecap: round;
+  stroke-linejoin: round;
+  stroke-width: 2;
+  width: 15px;
+}
+
 .u-nav .topbar {
   align-items: center;
   background: var(--surface);