docs: add app.config

.demo/content/1.index.md

@@ -82,6 +82,31 @@ navigation.title: 'Home'
 With a beautiful description
 ```
 
+### Theme configuration
+
+You can configure Content Wind global configuration in the `app.config.ts` file:
+
+```ts [signature]
+interface AppConfigInput {
+  cover?: string, // default: '/cover.jpg'
+  socials?: {
+    twitter?: string
+    github?: string
+  }
+}
+```
+
+Example of settings Twitter and GitHub icons in the navbar:
+
+```ts [app.config.ts]
+export default defineAppConfig({
+  socials: {
+    twitter: 'Atinux',
+    github: 'Atinux/content-wind'
+  }
+})
+```
+
 ### Icons
 
 Use any icon from [icones.js.org](https://icones.js.org) with the `<Icon>` component: