Better explain the course contents

_events/2021/08/2021-08-20-git-and-gitlab.md

 ---
-title: Project management with GitLab
+title: "Shell + Git + Project Management with GitLab"
 layout: event
 organizers:
   - erxleben
@@ -18,7 +18,7 @@ registration_period:
     from:   "2021-08-09"
     to:     "2021-08-15"
 excerpt:
-    "This workshop will focus on project management with the GitLab platform.
+    "This workshop aims to introduce project management with the GitLab platform.
     A primer for the prerequisite version control system Git will be offered to those not yet familiar with it."
 ---