better subheading size

Author: dburles

packages/docs/src/pages/getting-started/index.mdx

@@ -9,13 +9,13 @@ However, if you would prefer a minimal installation, you can instead start with
 
 ## Setup
 
-#### 1. Install Theme UI:
+### 1. Install Theme UI:
 
 ```sh
 npm i theme-ui
 ```
 
-#### 2. Create a theme object
+### 2. Create a theme object
 Include custom color, typography, and layout values:
 
 ```js
@@ -40,7 +40,7 @@ If you're using Gatsby, see the [Getting Started with Gatsby](/getting-started/g
 
 </Note>
 
-#### 3. Add the theme to your application
+### 3. Add the theme to your application
 
 Using the `ThemeProvider`, pass in the `theme` object as a prop: