fix(nginx): use standard proxy_pass for Grafana to fix 404s

docker/nginx.conf

@@ -79,9 +79,7 @@ http {
         }
 
         location /grafana/ {
-            rewrite ^/grafana/(.*) /$1 break;
-            
-            proxy_pass http://127.0.0.1:3000;
+            proxy_pass http://127.0.0.1:3000/;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;