[BRANDING] systemd service Type=simple

The problem is Type=notify - when that is set, systemd waits for a
signal from the service that it's ready so systemctl start forgejo
takes forever (or until it runs into a timeout).

Refs: https://codeberg.org/forgejo/forgejo/issues/777
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contrib/systemd/forgejo.service

@@ -52,7 +52,7 @@ After=network.target
 # Uncomment the next line if you have repos with lots of files and get a HTTP 500 error because of that
 # LimitNOFILE=524288:524288
 RestartSec=2s
-Type=notify
+Type=simple
 User=git
 Group=git
 WorkingDirectory=/var/lib/forgejo/