Made several tutorial doc pages

docs/source/api/evennia.contrib.tutorials.rst

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+evennia.contrib.tutorials package
+=================================
+
+.. automodule:: evennia.contrib.tutorials
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+
+.. toctree::
+   :maxdepth: 6
+
+   evennia.contrib.tutorials.batchprocessor
+   evennia.contrib.tutorials.bodyfunctions
+   evennia.contrib.tutorials.evadventure
+   evennia.contrib.tutorials.mirror
+   evennia.contrib.tutorials.red_button
+   evennia.contrib.tutorials.talking_npc
+   evennia.contrib.tutorials.tutorial_world