Updated MongoDB installation

docs/Downstream.rst

@@ -55,7 +55,7 @@ As long as you have a MongoDB instance running and an annotation job ran success
 through `pymongo <https://api.mongodb.com/python/current/>`_ as shown by the code below.
 Running the query will return a :code:`cursor` object, which can be iterated upon.
 
-If instead a list is intended to be created from it, simply add: `filter2 = list(filter2)`
+If instead a list is intended to be created from it, simply add: `filter2 = list(filter2)`. 
 
 .. WARNING:: If the number of variants in the database is large and the filtering is not set up correctly,
 returning a list will be probably crash your computer since lists are kept in memory. Iterating over the cursor

docs/Introduction.rst

@@ -33,18 +33,9 @@ The simplest way to install VAPr is from PyPI_ with pip_, Python's preferred pac
 MongoDB
 ~~~~~~~
 
-Further, MongoDB needs to installed and running. See the `official instructions <https://docs.mongodb.com/manual/installation>`_
-for details on how to install it on your platform. Alternatively, using Docker (possibly the easiest way):
+VAPr is written in Python and stores variant annotations in NoSQL database, using a locally-installed instance of MongoDB. `Installation instructions <https://docs.mongodb.com/manual/administration/install-community/>`_
 
 
-.. code-block:: bash
-
-    $ docker run --name vapr -it -p 27017:27017 mongo
-
-This may take a few seconds since the mongodb image needs to be downloaded from a repository. The process
-should produce logs that tells you that mongodb is running inside the container. Feel free to leave this
-terminal window open and proceed with the rest of the installation.
-
 .. _PyPI: https://pypi.python.org/pypi/yellowbrick
 .. _pip: https://docs.python.org/3/installing/