docs: reinstate newsletter sign-up link (#1057)

* docs: reinstate newsletter sign-up link

* docs: update form URL

docs/_includes/layouts/home.njk

@@ -22,6 +22,7 @@
         <p class="govuk-body">18 December 2024: The <a href="/content-standards/style-guide/">MoJ content style guide</a> is now live.</p>
           <p class="govuk-body">10 December 2024: The <a href="/components/interruption-card/">interruption card component</a> is now live. Use it to help users understand possible errors and avoid serious mistakes.</p>
           <p class="govuk-body">26 November 2024: We’ve archived the <a href="/archive/password-reveal/">password reveal component</a>. We recommend that teams use the <a href="https://design-system.service.gov.uk/components/password-input/">GOV.UK Design System password input</a> instead.</p>
+          <p class="govuk-body"><a href="https://docs.google.com/forms/d/1i7rinQINSjdQ6w_SChXqxQFTttPMgfcSfPamq8YRnP8/viewform">Sign up to get emails</a> about the MoJ Design System.</p>
         {% endcall %}
 
         {% call card({title: "Contribute to the MoJ Design System" })%}