Add GitLab to Overview

Author: danciaclara

docs/integrations/about.mdx

@@ -13,4 +13,7 @@ Plane's integrations make it easy to connect your workspace and projects with yo
   <Card title="Slack" icon="FaSlack" href="/integrations/slack">
     Connect Plane with Slack to create work items, sync discussions, and take action on tasks—all without leaving Slack.
   </Card>
+  <Card title="GitLab" icon="FaGitlab" href="/integrations/gitlab">
+    Connect GitLab to Plane to automate merge request tracking, link issues seamlessly, and streamline your development workflow.
+  </Card>
 </CardGroup>