chore: README tweaks

Author: jpadgett314

README.md

@@ -6,17 +6,16 @@ Live demo: https://jpadgett314.github.io/led-matrix-vocab
 
 ![Animation of scrolling text on LED Matrix modules](/docs/demo.webp)
 
-## Getting Started (User)
+## Installation
 
 This app can be saved to your desktop, enabling offline use. An install button will appear in the address bar or browser menu, if your browser supports Progressive Web Apps (all modern browsers).
 
 Having trouble? See [Installation Instructions](https://www.installpwa.com/from/jpadgett314.github.io%2Fled-matrix-vocab).
 
-That's it!
+> [!NOTE]  
+> This app uses the Web Serial API, which is only supported on Chromium-based browsers.
 
-One caveat: this app uses the Web Serial API, which is only supported on Chromium-based browsers.
-
-## Getting Started (Developer)
+## Development
 
 This project features a minimalist development workflow. There is currently no bundler; in fact, there is no build. The source code is served directly from the `public` directory.
 
@@ -33,7 +32,7 @@ Please contribute your suggestions and/or your code!
 
 This project is still in early stages. Feel free to submit drafts as PRs; I will help finalize them.
 
-## Attributions
+## Credits
 
 This repository includes the following third-party assets: