fix long line in code block messing with page width

posts/self-hosting-goatcounter-nginx.md

@@ -81,7 +81,11 @@ After=nginx
 
 [Service]
 Type=simple
-ExecStart=/usr/local/bin/goatcounter serve -listen localhost:8085 -db "sqlite://home/noah/db/goatcounter.sqlite3" -tls none -port 8085
+ExecStart=/usr/local/bin/goatcounter serve \
+          -listen localhost:8085 \
+          -db "sqlite://home/noah/db/goatcounter.sqlite3" \
+          -tls none \
+          -port 8085
 Restart=always
 RestartSec=10