update pip to conda for quantecon package

[mmcky]

Note:

There is still a need to introduce pip given pandas-datareader is a pip install in pandas.rst so I have amended getting_started to mention both pip and conda.

source/rst/./getting_started.rst:Other libraries can be installed with pip or conda.
source/rst/./pandas.rst: !pip install --upgrade pandas-datareader

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[mmcky]

this PR removes quantecon from environment.yml to ensure lectures are setup to bring in the quantecon package from conda-forge

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[mmcky]

Decided to use pkg/main to simplify conda install. The quantecon package gets included in the pkgs/main channel within ~7-10 days of updating through conda-forge.

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[mmcky]

@jstac I changed this to use conda from pip for consistency but interpolations will need the conda-forge channel to be specified. Is this OK?

[jstac]

Yes, that's totally fine, thanks Matt.

Does quantecon come with a fresh install of Anaconda now? Or does it need to be installed manually through conda?

If the former, perhaps don't need to tell people to install it specifically.

[mmcky]

thanks @jstac. The package appears in pkgs/main channel for conda but isn't listed as a package for the anaconda installer: https://docs.anaconda.com/anaconda/packages/py3.7_linux-64/ so it doesn't come with anaconda.