Moved wiki install guides into installation.md directly (#5869)

* Moved wiki install guides into installation.d directly

* Platform agnostic install instructions; removed PyMC3 instructions

* Tweaks to text

* Attempt to fix pre-commit failure

Author: fonnesbeck

docs/source/installation.md

@@ -1,13 +1,29 @@
 (installation)=
 # Installation
 
-To install PyMC, select the operating system where you want to perform the installation.
+We recommend using [Anaconda](https://www.anaconda.com/) (or [Miniforge](https://github.com/conda-forge/miniforge)) to install Python on your local machine, which allows for packages to be installed using its `conda` utility.
 
-## Linux
-[Linux installation guide](https://github.com/pymc-devs/pymc/wiki/Installation-Guide-(Linux))
+Once you have installed one of the above, PyMC can be installed into a new conda environment as follows:
 
-## MacOS
-[MacOS installation guide](https://github.com/pymc-devs/pymc/wiki/Installation-Guide-(MacOS))
+```console
+conda create -c conda-forge -n pymc_env pymc
+conda activate pymc_env
+```
+If you like, replace the name `pymc_env` with whatever environment name you prefer.
 
-## Windows
-[Windows installation guide](https://github.com/pymc-devs/pymc/wiki/Installation-Guide-(Windows))
+
+## JAX sampling
+
+If you wish to enable sampling using the JAX backend via NumPyro, the following should also be installed:
+
+```console
+pip install numpyro
+```
+
+Similarly, to use BlackJAX for sampling it should be installed via `pip`:
+
+```console
+pip install jax jaxlib blackjax
+```
+
+Note that JAX is not directly supported on Windows systems at the moment.