docs(readme): fix table of contents (#216)

And update features, remove commented line from pyproject.toml

Author: wpbonelli

README.md

@@ -20,7 +20,7 @@
 
 Python development tools for MODFLOW 6 and related projects.
 
-- [Use cases](#use-cases)
+- [Features](#features)
 - [Requirements](#requirements)
 - [Installation](#installation)
 - [Documentation](#documentation)
@@ -31,10 +31,10 @@ Python development tools for MODFLOW 6 and related projects.
 
 * a minimal GitHub API client for release info/assets
 * a `ZipFile` subclass that [preserves file permissions](https://stackoverflow.com/questions/39296101/python-zipfile-removes-execute-permissions-from-binaries) (workaround for [Python #15795](https://bugs.python.org/issue15795))
-* pytest fixtures including "keepable" tempdirs
+* pytest fixtures including "keepable" temporary directories and snapshot testing utilities
 * pytest markers to skip test cases conditional on operating system, installed packages, or available executables
 * a parser for MODFLOW 6 [definition files](https://modflow6.readthedocs.io/en/stable/_dev/dfn.html)
-* streamlined access to MODFLOW 6 models in
+* a models API for streamlined access to MODFLOW 6 (and other) models in
   - [`MODFLOW-ORG/modflow6-examples`](https://github.com/MODFLOW-ORG/modflow6-examples)
   - [`MODFLOW-ORG/modflow6-testmodels`](https://github.com/MODFLOW-ORG/modflow6-testmodels)
   - [`MODFLOW-ORG/modflow6-largetestmodels`](https://github.com/MODFLOW-ORG/modflow6-largetestmodels)

pyproject.toml

@@ -168,7 +168,6 @@ line-length = 88
 
 [tool.ruff.lint]
 select = [
-    # "ARG",  # flake8-unused-arguments
     "C4",   # flake8 comprehensions
     "D409", # pydocstyle - section-underline-matches-section-length
     "E", "W", # pycodestyle