fix(docs): demo link in docs intro (#472)

Author: whysthatso

packages/docs/content/docs/intro.mdx

@@ -17,7 +17,7 @@ At its core, Static CMS is an open-source React app that acts as a wrapper for t
 
 ## Find out more
 
-- Get a feel for the UI in the [demo site](https://demo-staticcms.org/). (No login required. Click the login button to go straight to the CMS editor UI.)
+- Get a feel for the UI in the [demo site](https://demo.staticcms.org/). (No login required. Click the login button to go straight to the CMS editor UI.)
 - [Start with a template](/docs/start-with-a-template/) to make a Static CMS-enabled site of your own.
 - Configure your existing site by following a [tutorial](/docs/add-to-your-site/) or checking [configuration options](/docs/configuration-options).
 - Ask questions and share ideas in the Static CMS [community chat](/chat).