Use fingerprint for logo.png

Force the browser to reload the image if it changed on the server.

See https://gohugo.io/functions/resources/fingerprint/

Author: CarlSchwan

static/logo.png renamed to assets/img/logo.png

@@ -1,5 +1,7 @@
 <a href="/">
-  <img src="/logo.png" class="mt-4 mb-2" width="400" height="174" alt="Open Transport Community Logo" />
+  {{ with resources.Get "img/logo.png" | resources.Fingerprint }}
+    <img src="{{ .Permalink }}" class="mt-4 mb-2" width="{{ .Width }}" height="{{ .Height }}" alt="Open Transport Community Logo" />
+  {{ end }}
 </a>
 
 <h1 class="text-3xl sm:text-5xl font-bold my-4 text-center">