Split up docs. Closes #122

docs/systemd.md

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+## systemd configuration
+
+If you want Spothole to run automatically on startup on a Linux distribution that uses `systemd`, follow the
+instructions here. For distros that don't use `systemd`, or Windows/OSX/etc., you can find generic instructions for your
+OS online.
+
+Create a file at `/etc/systemd/system/spothole.service`. Give it the following content, adjusting for the user you want
+to run it as and the directory in which you have installed it:
+
+```
+[Unit]
+Description=Spothole
+After=syslog.target network.target
+
+[Service]
+Type=simple
+User=spothole
+WorkingDirectory=/home/spothole/spothole
+ExecStart=/home/spothole/spothole/.venv/bin/python /home/spothole/spothole/spothole.py --serve-in-foreground
+Restart=on-abort
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Run the following:
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable spothole
+sudo systemctl start spothole
+```
+
+Check the service has started up correctly with `sudo journalctl -u spothole -f`.