Add aspen to themes (#867)

* add aspen to themes

* added images

* added images to the repo

---------

Co-authored-by: Ruhan <[email protected]>

Author: ethanpalm

images/themes/aspen-dark.png

@@ -39,7 +39,7 @@ This section contains the full reference for the `docs.json` file.
 <ResponseField name="theme" required>
   The layout theme of your site.
 
-One of the following: `mint`, `maple`, `palm`, `willow`, `linden`, `almond`.
+One of the following: `mint`, `maple`, `palm`, `willow`, `linden`, `almond`, `aspen`.
 
 See [Themes](themes) for more information.
 

images/themes/aspen-light.png

@@ -52,6 +52,8 @@ export const ThemeCard = ({ title, value, description, href }) => {
 
 <ThemeCard title="Almond" value="almond" description="Card-based organization meets minimalist design for intuitive navigation." href="https://almond.mintlify.app" />
 
+<ThemeCard title="Aspen" value="aspen" description="Modern documentation crafted for complex navigation and custom components." href="https://aspen.mintlify.app" />
+
 </div>
 
 </div>