Add warnings about dropping support for python 3.8 (#1041)

* Add statement about supporting active python versions and warnings regarding dropping 3.8 support

* Try formatting warning differently.

* Simpler formatting for warning.

README.md

@@ -13,6 +13,9 @@ the conversation in [GitHub Discussions](https://github.com/NREL/floris/discussi
 
 ## Installation
 
+**WARNING:**
+Support for python version 3.8 will be dropped in FLORIS v4.3. See [Installation documentation](https://nrel.github.io/floris/installation.html#installation) for details.
+
 **If upgrading from a previous version, it is recommended to install FLORIS v4 into a new virtual environment**.
 If you intend to use [pyOptSparse](https://mdolab-pyoptsparse.readthedocs-hosted.com/en/latest/) with FLORIS,
 it is recommended to install that package first before installing FLORIS.

docs/index.md

@@ -8,6 +8,10 @@ is highly encouraged. If you are interested in using FLORIS to conduct studies
 of a wind farm or extending FLORIS to include your own wake model, please join
 the conversation in [GitHub Discussions](https://github.com/NREL/floris/discussions/)!
 
+```{note}
+Support for python version 3.8 will be dropped in FLORIS v4.3. See {ref}`installation` for details.
+```
+
 ## Quick Start
 
 FLORIS is a Python package run on the command line typically by providing

docs/installation.md

@@ -7,11 +7,16 @@ The following sections detail how download and install FLORIS for each use case.
 (requirements)=
 ## Requirements
 
-FLORIS is intended to be used with Python 3.8 and up, and it is highly recommended that users
+FLORIS is a python package. FLORIS is intended to work with all [active versions of python](https://devguide.python.org/versions/). Support will drop for python versions once they reach end-of-life.
+It is highly recommended that users
 work within a virtual environment for both working with and working on FLORIS, to maintain a clean
 and sandboxed environment. The simplest way to get started with virtual environments is through
 [conda](https://docs.conda.io/en/latest/miniconda.html).
 
+```{warning}
+Support for python version 3.8 will be dropped in FLORIS v4.3.
+```
+
 Installing into a Python environment that contains a previous version of FLORIS may cause conflicts.
 If you intend to use [pyOptSparse](https://mdolab-pyoptsparse.readthedocs-hosted.com/en/latest/)
 with FLORIS, it is recommended to install that package first before installing FLORIS.