New shutdown script for cross-platform ease of use; implement host option in config file; minor code cleanup.

read-config.mjs

@@ -1,7 +1,13 @@
 import { readFile } from 'node:fs/promises';
+
+//  Parse the config file to grab a property value from it.
 let property = JSON.parse(await readFile(new URL("./src/config.json", import.meta.url)));
+//  Combine all descriptors (from command line arguments) to get the property value.
 process.argv.slice(2).forEach(descriptor => {property = property[descriptor]});
+
+//  Return a boolean if it's true or false.
 if (typeof property === "boolean") process.exitCode = +!property;
+//  Otherwise, return a stringified version to the stream.
 else {
   console.log(property);
   process.exitCode = 0;