Made several tutorial doc pages

docs/source/api/evennia.web.api.rst

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+evennia.web.api package
+=======================
+
+.. automodule:: evennia.web.api
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+
+
+.. toctree::
+   :maxdepth: 6
+
+   evennia.web.api.filters
+   evennia.web.api.permissions
+   evennia.web.api.root
+   evennia.web.api.serializers
+   evennia.web.api.tests
+   evennia.web.api.urls
+   evennia.web.api.views