Update cli build.mdx

src/content/docs/v4/cli/build.mdx

@@ -11,8 +11,12 @@ Build your bot
 Options:
   -f --format [fmt]        The module system of your application. `cjs` or `esm` (default: "esm")
   -m --mode [mode]         the mode for sern to build in. `production` or `development` (default: "development")
+  -w --watch
   -W --suppress-warnings   suppress experimental warning
-  -p --project [filePath]  build with this sern.build file
+  -p --project [filePath]  build with the provided sern.build file
+  -e --env                 path to .env file
+  --source-maps            Whether to add source-maps to configuration (default: false)
+  --tsconfig [filePath]    Use this tsconfig
   -h, --help               display help for command
 ```
 
@@ -44,8 +48,6 @@ The `sern build` command comes equipped with a range of features designed to enh
 
 - **Zero Configuration**: Building your bot application without additional configuration. The CLI handles most of the setup for you.
 
-- **Experimental Image Support**: We've introduced experimental support for top-level imports of PNG and JPG files, making it easier to include images in your bot application.
-
 - **Compile Time Constants**: Customize your build with constants such as `__DEV__`, `__PROD__`, allowing you to tailor your application to different production stages.
 
 - **Development and Production Modes**: The CLI supports both development and production modes, enabling you to tailor your bot application for different stages of development.
@@ -112,6 +114,23 @@ type BuildOptions = {
 sern build
 ```
 
+## sern build --watch 
+
+the watch flag needs a `start` command. Depending on the **lock file** in your project, sern will run this command to reload your project. the build command checks in this order:
+```js
+  // npm
+  if (pathExistsSync('package-lock.json')) return 'npm start';
+  // yarn
+  if (pathExistsSync('yarn.lock')) return 'yarn start';
+  // pnpm
+  if (pathExistsSync('pnpm-lock.yaml')) return 'pnpm start';
+  // bun 1.1
+  if (pathExistsSync('bun.lockb')) return 'bun start';
+  // bun 1.2
+  if (pathExistsSync('bun.lock')) return 'bun start';
+```
+
+
 (that was easy)
 
 ## Adapting Older Projects