Simply utility class usage

Instead of using `gl-mt-5.gl-mb-5` use `gl-my-5` instead.

app/views/projects/_home_panel.html.haml

@@ -3,7 +3,7 @@
 - max_project_topic_length = 15
 - emails_disabled = @project.emails_disabled?
 
-.project-home-panel.js-show-on-project-root.gl-mt-5.gl-mb-5{ class: [("empty-project" if empty_repo)] }
+.project-home-panel.js-show-on-project-root.gl-my-5{ class: [("empty-project" if empty_repo)] }
   .row.gl-mb-3
     .home-panel-title-row.col-md-12.col-lg-6.d-flex
       .avatar-container.rect-avatar.s64.home-panel-avatar.gl-flex-shrink-0.gl-w-11.gl-h-11.gl-mr-3.float-none