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.

scripts/start-kanban.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "${ROOT_DIR}"
+
+export KANBAN_HOST="${KANBAN_HOST:-127.0.0.1}"
+export KANBAN_PORT="${KANBAN_PORT:-5180}"
+export KANBAN_AUTH_SECURE_COOKIE="${KANBAN_AUTH_SECURE_COOKIE:-1}"
+export KANBAN_REQUIRE_HTTPS="${KANBAN_REQUIRE_HTTPS:-1}"
+
+exec npm start