[WIP] Replace installation instructions on README with wiki links (#4413)

* Updated Mauna Loa notebook

* Replaced installation instructions with links to platform-specific guides on wiki

* Fixed rst link syntax

Author: fonnesbeck

README.rst

@@ -77,80 +77,11 @@ and as part of `PyMCon 2020 <https://discourse.pymc.io/c/pymcon/2020talks/15>`__
 Installation
 ============
 
-PyMC3 Installation
-------------------
+To install PyMC3 on your system, follow the instructions on the appropriate installation guide:
 
-The latest release of PyMC3 can be installed from Conda Forge (conda-forge):
-
-::
-
-    conda install -c conda-forge pymc3
-
-While strongly discouraged due to installation problems you could try to install PyMC3 and its dependencies via PyPI using ``pip``:
-
-::
-
-    pip install pymc3
-
-The reason installation via PyPI is difficult, especially on Windows and OSX, is that ``Theano`` requires compilation against MKL, which is difficult to set up, while Conda comes with its own compilers and MKL installation.
-.. note::
-
-    Running ``pip install pymc`` will install PyMC 2.3, not PyMC3, from PyPI.
-
-The current development branch of PyMC3 can be installed from GitHub, also using ``pip``:
-
-::
-
-    pip install git+https://github.com./pymc-devs/pymc3
-
-Make sure to install the `Theano-PyMC <https://github.com./pymc-devs/Theano-PyMC>`__ version that is pegged in ``PyMC3``'s ``requirements.txt``.
-For more information, see the `Theano-PyMC <https://github.com./pymc-devs/Theano-PyMC>`__ Installation section, below.
-
-Lastly, another option is to clone the repository and install PyMC3 using
-``python setup.py install`` or ``python setup.py develop``.
-
-Theano-PyMC Installation
-------------------------
-
-PyMC3 is tested on Python 3.6, 3.7, and 3.8 and depends on NumPy, SciPy, and pandas
-(see `requirements.txt <https://github.com./pymc-devs/pymc3/blob/master/requirements.txt>`__ for version
-information).
-
-Moreover, as of Late 2020, PyMC3 now requires `Theano-PyMC <https://github.com./pymc-devs/Theano-PyMC>`__ instead of `Theano <https://github.com./Theano/Theano>`__.
-
-That being said, you can install PyMC3 using the ``requirements.txt``
-file.
-
-This requires cloning the repository to your computer:
-
-::
-
-    git clone https://github.com./pymc-devs/pymc3
-    cd pymc3
-    pip install -r requirements.txt
-
-.. note::
-
-   * If you have Theano installed, please remove it and install Theano-PyMC via Conda Forge, seen below:
-
-    ``conda remove theano``
-
-   * If you have an outdated version of Theano-PyMC, then re-install the module via Conda Forge:
-
-    ``conda remove theano-pymc -y``
-
-    ``conda install -c conda-forge theano-pymc -y``
-
-Arviz Installation
-------------------
-
-Plotting is done using `ArviZ <https://arviz-devs.github.io/arviz/>`__ - if you follow the installation instructions above, then it will be installed alongside ``PyMC3``.
-
-Optional
---------
-
-In addtion to the above dependencies, the GLM submodule relies on
-`Patsy <http://patsy.readthedocs.io/en/latest/>`__.
+-  `Installing PyMC3 on MacOS <https://github.com./pymc-devs/pymc3/wiki/Installation-Guide-(MacOS)>`__
+-  `Installing PyMC3 on Linux <https://github.com./pymc-devs/pymc3/wiki/Installation-Guide-(Linux)>`__
+-  `Installing PyMC3 on Windows <https://github.com./pymc-devs/pymc3/wiki/Installation-Guide-(Windows)>`__
 
 
 Citing PyMC3