docs: update quickstart

docs.json

@@ -7,7 +7,7 @@
       "Getting Started",
       [
         ["Overview", "/"],
-        ["Getting Started", "/gettingstarted"],
+        ["Getting Started", "/getting_started"],
         ["Quick Start", "/quickstart"],
         ["Viewer", "/viewer"],
         ["Camera Manipulation", "/camera_manipulation"]

docs/quickstart.mdx

@@ -1,16 +1,16 @@
-# ViewerWidget Documentation
+# Quick Start
 
-`ViewerWidget` is a simplified wrapper around the Thermion 3D viewer that makes it easy to display 3D models in your Flutter application.
+If all you need is a quick and easy route to rendering a single 3D model in your Flutter application, start with `ViewerWidget`.
 
-## Overview
+This is a simplified, Flutter-only wrapper around the underlying 3D rendering API with sane defaults for most people.
 
-`ViewerWidget` handles the setup and configuration of a Thermion viewer, including:
+`ViewerWidget` handles all the setup and configuration of the underlying Thermion API, including:
 - Loading 3D models (glTF assets)
 - Configuring skyboxes and image-based lighting
 - Setting up camera positions and manipulators
 - Managing the rendering lifecycle
 
-## Installation
+## Setup
 
 Follow the steps listed in [Getting Started](./getting_started) to configure your Flutter installation and project.