Replace the node-static package with serve-handler (#9)

It appears that node-static module hasn't been updated for 6 years and
it has some vulnerabilities. On the other and serve-handler is the core
package of `serve`, which is maintained by vercel. So it looks like it's
a safer option. There were more options to choose from, but that looks
like a good option, and required less effort to migrate.

package.json

@@ -12,8 +12,8 @@
   "dependencies": {
     "crc-full": "^1.1.0",
     "node-hid": "^3.0.0",
-    "node-static": "^0.7.11",
     "serialport": "^12.0.0",
+    "serve-handler": "^6.1.6",
     "usb": "^2.9.0"
   }
 }

usb-power-profiling.js

@@ -5,7 +5,7 @@ const url = require('url');
 const { createDecipheriv } = require('node:crypto');
 const { SerialPort } = require('serialport');
 const { CRC } = require('crc-full');
-const nStatic = require('node-static');
+const serveHandler = require('serve-handler');
 
 const CHARGER_LAB_VENDOR_ID = 0x5FC9;
 const FNIRSI_VENDOR_ID = 0x2E3C;
@@ -1435,19 +1435,18 @@ const app = (req, res) => {
   }
 
   if (req.url == "/" || req.url == "/index.html") {
-    fileServer.serveFile('/index.html', 200, {}, req, res);
+    serveHandler(req, res, { public: '.' });
   }
 };
 
-var server, fileServer;
+var server;
 
 async function runPowerCollectionServer(customPort) {
   const port = customPort || process.env.PORT || 2121;
   server = http.createServer(app)
   server.listen(port, "0.0.0.0", () => {
     console.log(`Ensure devtools.performance.recording.power.external-url is set to http://localhost:${port}/power in 'about:config'.`);
   });
-  fileServer = new nStatic.Server();
 }
 
 if (require.main === module) {