Fall back to static serving if not collected

Fixes #218

docker/nginx.conf

@@ -40,6 +40,13 @@ http {
         # Serves static files from the collected dir
         location /static/ {
             alias /takahe/static-collected/;
+            try_files $uri /static//static-real$uri;
+        }
+
+        # Static fallback for dev mode
+        location /static-real/ {
+            internal;
+            proxy_pass http://takahe/;
         }
 
         # Proxies media and remote media with caching