Hash admin passwords

src/config.rs

@@ -110,3 +110,9 @@ pub fn read_config(dir: &Path) -> Config {
 		.expect("Bad JSON in config file")
 	}
 }
+
+pub fn write_config(dir: &Path, config: &Config) {
+	let path = dir.join(CONFIG_FILE);
+	std::fs::write(path, toml_edit::easy::to_string_pretty(&config).unwrap())
+		.expect("Cannot write config file");
+}