fix: drop plot styles (already in flopy)

.github/workflows/ci.yml

@@ -132,7 +132,7 @@ jobs:
         working-directory: modflow-devtools
         run: |
           pip install .
-          pip install ".[test, optional]"
+          pip install ".[test]"
 
       - name: Cache modflow6 examples
         id: cache-examples

README.md

@@ -29,7 +29,7 @@ Python development tools for MODFLOW 6.
 
 ## Use cases
 
-This is a small toolkit for developing MODFLOW 6, FloPy, and related projects. It includes standalone utilities and optional [Pytest](https://github.com/pytest-dev/pytest) and [Matplotlib](https://matplotlib.org/stable/) extensions.
+This is a small toolkit for developing MODFLOW 6, FloPy, and related projects. It includes standalone utilities and optional [Pytest](https://github.com/pytest-dev/pytest) extensions.
 
 Utilities include:
 
@@ -50,8 +50,6 @@ Pytest features include:
   - `MODFLOW-USGS/modflow6-testmodels`
   - `MODFLOW-USGS/modflow6-largetestmodels`
 
-Matplotlib styles are provided in the `modflow_devtools.figspecs` module.
-
 ## Requirements
 
 Python3.8+, dependency-free, but pairs well with `pytest` and select plugins, e.g.

docs/index.rst

@@ -29,7 +29,6 @@ The `modflow-devtools` package provides a set of tools for developing and testin
    :caption: Miscellaneous
 
    md/download.md
-   md/figspec.md
    md/latex.md
    md/ostags.md
    md/zip.md