add gemini server

networking/servers/agate.md

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+Make sure your dns is in order.
+My domain name is `belgradecats.tk`, so put your own in there.
+
+Install agate by placing the binary somewhere or (on Arch):
+
+> yay -S agate
+
+---
+
+> sudo mkdir -p /usr/share/gemini/{certs,gemini}
+
+> sudo useradd gemini -d /usr/share/gemini
+
+> sudo chown -R gemini:gemini /usr/share/gemini
+
+> sudo su gemini
+
+> cd
+
+> echo 'Hello Gemworld!' > gemini/index.gmi
+
+> cd /usr/share/gemini/certs
+
+> openssl req -new -subj "/CN=belgradecats.tk" -x509 -newkey ec pkeyopt ec_paramgen_curve:prime256v1 -days 3000 -nodes -out cert.pem keyout key.pem
+
+Make a service file.
+
+> sudo vim /etc/systemd/system/multi-user.target.wants/agate.service
+
+
+```
+[Unit]
+Description=agate
+After=network.target
+
+[Service]
+User=gemini
+Type=simple
+ExecStart=/usr/bin/agate -s --content /usr/share/gemini/gemini --key /usr/share/gemini/certs/key.pem --cert /usr/share/gemini/certs/cert.pem --hostname belgradecats.tk --lang en-GB
+
+[Install]
+WantedBy=default.target
+
+```
+
+> sudo systemctl daemon-reload
+
+> sudo systemctl enable --now agate
+