Restic server shall be called Rest server from now on

The repo moved from github.com/zcalusic/restic-server to the new home
github.com/restic/rest-server

etc/rest-server.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=Rest Server
+After=syslog.target
+After=network.target
+
+[Service]
+Type=simple
+User=www-data
+Group=www-data
+ExecStart=/usr/local/bin/rest-server -path /tmp/restic
+Restart=always
+RestartSec=5
+StartLimitInterval=0
+
+[Install]
+WantedBy=multi-user.target