chore: revert #1794 for now until permanent init architecture is established

docs/authentication/using-middleware.mdx

@@ -25,25 +25,24 @@ payload.init({
   secret: 'PAYLOAD_SECRET_KEY',
   mongoURL: 'mongodb://localhost/payload',
   express: app,
-  onInit: async () => {
-    const router = express.Router();
+});
 
-    router.use(payload.authenticate); // highlight-line
+const router = express.Router();
 
-    router.get('/', (req, res) => {
-      if (req.user) {
-        return res.send(`Authenticated successfully as ${req.user.email}.`);
-      }
+router.use(payload.authenticate); // highlight-line
 
-      return res.send('Not authenticated');
-    });
+router.get('/', (req, res) => {
+  if (req.user) {
+    return res.send(`Authenticated successfully as ${req.user.email}.`);
+  }
 
-    app.use('/some-route-here', router);
+  return res.send('Not authenticated');
+});
 
-    app.listen(3000, async () => {
-      payload.logger.info(`listening on ${3000}...`);
-    });
-  },
+app.use('/some-route-here', router);
+
+app.listen(3000, async () => {
+  payload.logger.info(`listening on ${3000}...`);
 });
 
 ```

docs/getting-started/installation.mdx

@@ -66,7 +66,7 @@ app.listen(3000, async () => {
 });
 ```
 
-This server doesn't do anything just yet. But, after you have this in place, we can initialize Payload via its `init()` method, which accepts a small set of arguments to tell it how to operate. For a full list of `init` arguments, please consult the [main configuration](/docs/configuration/overview) docs.
+This server doesn't do anything just yet. But, after you have this in place, we can initialize Payload via its `init()` method, which accepts a small set of arguments to tell it how to operate. For a full list of `init` arguments, please consult the [main configuration](/docs/configuration/overview#init) docs.
 
 To initialize Payload, update your `server.js` file to reflect the following code:
 
@@ -80,13 +80,12 @@ payload.init({
   secret: 'SECRET_KEY',
   mongoURL: 'mongodb://localhost/payload',
   express: app,
-  onInit: () => {
-    app.listen(3000, async () => {
-      console.log('Express is now listening for incoming connections on port 3000.')
-    });
-  }
 })
 
+app.listen(3000, async () => {
+	console.log('Express is now listening for incoming connections on port 3000.')
+});
+
 ```
 
 Here is a list of all properties available to pass through `payload.init`: