docs - custom logout url

docs/my-website/docs/proxy/self_serve.md

@@ -123,4 +123,18 @@ LiteLLM Enterprise: Enable [SSO login](./ui.md#setup-ssoauth-for-ui)
 4. User can now create their own keys
 
 
-<Image img={require('../../img/ui_self_serve_create_key.png')}  style={{ width: '800px', height: 'auto' }} />
+<Image img={require('../../img/ui_self_serve_create_key.png')}  style={{ width: '800px', height: 'auto' }} />
+
+
+## Advanced
+### Setting custom logout URLs
+
+Set `PROXY_LOGOUT_URL` in your .env if you want users to get redirected to a specific URL when they click logout
+
+```
+export PROXY_LOGOUT_URL="https://www.google.com"
+```
+
+<Image img={require('../../img/ui_logout.png')}  style={{ width: '400px', height: 'auto' }} />
+
+