Merge pull request 'fix: remove fallback image from dashboard race hero' (#35) from fix/dashboard-hero-background-layering into main

Reviewed-on: admin/runners-calendar#35

frontend/src/styles/global.css

@@ -1358,8 +1358,7 @@ body {
 .dashboard-hero--with-image {
   background:
     linear-gradient(90deg, rgba(7, 25, 39, 0.94) 0%, rgba(7, 25, 39, 0.68) 48%, rgba(7, 25, 39, 0.2) 100%),
-    var(--dashboard-hero-image) center / cover,
-    url("/images/runner-hero.jpg") center / cover;
+    var(--dashboard-hero-image) center / cover;
 }
 
 .dashboard-hero__content,