Update Development section in README.md

Author: mattt

README.md

@@ -244,31 +244,55 @@ jobs:
 ```
 
 ## Development
+
 ### Web Assets
 
-To make changes to the CSS files, you need to have Node and a package manager such as `npm` installed. To get started:
+CSS assets used by the HTML output format
+are processed and generated by [PostCSS](https://postcss.org).
+To make changes to these assets,
+you'll need to have [Node.js](https://nodejs.org/en/)
+and a package manager, such as [`npm`](https://www.npmjs.com),
+installed on your machine.
+
+Navigate to the `.node` directory
+and run `npm install` to download the required tools and libraries.
 
 ```terminal
 $ cd .node
 $ npm install
 ```
 
-To process the PostCSS files during development:
+> **Note**:
+> `package.json` is located at a hidden `.node` subdirectory
+> to prevent Xcode from displaying or indexing the contents of `node_modules`
+> when opening the main project.
+
+From the `.node` directory,
+run the `watch` script
+to start watching for changes to files in the `Assets` folder.
+Whenever an asset source file is added, removed, or updated,
+its corresponding (unoptimized) product is automatically generated
+in the `Resouces` folder.
 
 ```terminal
-$ cd .node
 $ npm run watch
 ```
 
-This will start watching the source files in `Assets`  with hot-reload support, auto-generating non-optimized assets in `Resources` whenever a source file is saved.
-
-Once happy with the results, run this command to create production-ready assets:
+When you're happy with the results,
+run the `build` script to generate production-ready assets.
 
 ```terminal
 $ npm run build
 ```
 
-Both the source files and the generated files are checked into this repository.
+Finally,
+commit any changes to the source files in `Assets`
+as well as the generated files in `Resources`. 
+
+```terminal
+$ git add Assets Resources
+$ git commit
+```
 
 ## License