Add user import and export scripts

scripts/export_users.js

@@ -0,0 +1,11 @@
+const fs = require("fs").promises
+const pj = require("path").join
+const db = require("../src/lib/db")
+
+;(async () => {
+	const users = db.prepare("SELECT * FROM Users").all()
+	const targetDir = process.argv.slice(2).includes("--publish") ? "../src/site/html" : ".."
+	const target = pj(__dirname, targetDir, "users_export.json")
+	fs.writeFile(target, JSON.stringify(users), {encoding: "utf8"})
+	console.log(`Users exported to ${target}`)
+})()