[Docs] Add tons of screenshots

docs/admin/30_configure.rst

@@ -11,6 +11,14 @@ This can be useful if you only want to count certain absences.
 For example, if a student is busy at a school event and misses lessons,
 this may not be counted as a normal absence.
 
+.. image:: ../_static/excuse_types.png
+  :width: 100%
+  :alt: List with defined excuse types
+
+.. image:: ../_static/create_excuse_type.png
+  :width: 100%
+  :alt: Form for creating new excuse types
+
 Extra marks
 -----------
 
@@ -18,8 +26,24 @@ Some remarks are repeated over and over again, such as 'Forgot homework'.
 In order not to have to write this again and again in the remark field,
 additional marks can be set, which then only have to be clicked on in the class register.
 
+.. image:: ../_static/extra_marks.png
+  :width: 100%
+  :alt: List with defined extra marks
+
+.. image:: ../_static/create_extra_mark.png
+  :width: 100%
+  :alt: Form for creating new extra marks
 
 Group roles
 -----------
 
-To manage additional rights to the data in the class register, group roles can be defined here.
\ No newline at end of file
+To track special roles in groups in the class register, group roles
+like class representatives or ventilation services can be defined here.
+
+.. image:: ../_static/group_roles.png
+  :width: 100%
+  :alt: Overview about group roles
+
+.. image:: ../_static/edit_group_role.png
+  :width: 100%
+  :alt: Form for managing a group role
\ No newline at end of file