✏️ Fix rst directive

Author: veit

README.rst

@@ -5,11 +5,11 @@ python.berlin
 The `python.berlin <https://python.berlin>`_ website allows all Berlin Python
 User Groups to introduce themselves, present slides, code examples etc.
 
-.. collaboration:
-
 🤝 Collaboration
 ================
 
+.. collaboration:
+
 If you have suggestions for improvements and additions, I recommend that you
 create a `Fork <https://github.com/python-berlin/python.berlin_website/fork>`_
 of our `GitHub Repository

docs/collaboration.rst

@@ -1,2 +1,5 @@
+🤝 Collaboration
+================
+
 .. include:: README.rst
    :start-after: collaboration