Development: Add calendar and lecture series documentation (ls1intum#11626)

Author: marlonnienaber

docs/index.rst

@@ -43,6 +43,7 @@ All these exercises are supposed to be run either live in the lecture with insta
    user/sharing
    user/mobile-applications
    user/lti
+   user/calendar
 
 
 .. toctree::

docs/user/calendar.rst

@@ -0,0 +1,4 @@
+Calendar
+========
+
+See the new documentation’s article `Calendar <https://ls1intum.github.io/Artemis/student/calendar>`__.

docs/user/lectures.rst

@@ -202,6 +202,11 @@ Competencies
 Instructors can create competencies, which are desired learning objectives, and link lecture units to them.
 See :ref:`Adaptive Learning <adaptive-learning>` for more information.
 
+Lecture Series
+--------------
+
+See the new documentation’s article `Lecture Series <https://ls1intum.github.io/Artemis/instructor/lecture-series>`__.
+
 
 .. |general-menu| image:: lectures/general-menu-lecture.png
     :width: 250