📝 Add collaboration section

Author: veit

README.rst

@@ -6,8 +6,10 @@ The `python.berlin <https://python.berlin>`_ website allows all Berlin Python
 User Groups to introduce themselves, present presentation 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>`_
@@ -29,8 +31,9 @@ Download and installation
    .. code-block:: console
 
     $ cd python.berlin_website
-    $ python3 -m pip install -r requirements.txt
+    $ python3 -m pip install -r requirements_dev.txt
     $ source bin/activate
+    $ pre-commit install
 
 #. Create HTML
 

collaboration.rst

@@ -0,0 +1,2 @@
+.. include:: README.rst
+   :start-after: collaboration

index.rst

@@ -54,6 +54,7 @@ In Berlin there is a diverse scene around the Python programming language.
    djangogirls-berlin/index
    opentechschool-berlin/index
    pydata-berlin/index
+   collaboration
 
 .. Indices and tables
    ==================