ops: add deployment scripts and nginx/systemd configs

Scripts for installing and starting the app and nginx proxy.
Includes systemd user service units and nginx configs for
both user-mode 8443 and system-mode 443.

deploy/systemd/local-kanban.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Local Kanban Node app
+After=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=/home/gahow/projects/kanban
+ExecStart=/home/gahow/projects/kanban/scripts/start-kanban.sh
+Restart=always
+RestartSec=3
+Environment=NODE_ENV=production
+
+[Install]
+WantedBy=default.target