Updated the title of the page

app/views/design-system/index.html

@@ -1,5 +1,5 @@
 {% set pageName = "Design system" %}
-{% set pageDescription = "Understand how to ensure we design consistent services for Department for Education users." %}
+{% set pageDescription = "Use the DfE Design System design consistent services for people using Department for Education services." %}
 {% set selectedNav = "Design system" %}
 {% set lastUpdated = "April 2023" %}
 {% set backlog_issue_id = "44" %}