MNT: Remove no-longer-needed setup.py

Also update some docs around install, etc.

docs/developerguide.rst

@@ -66,22 +66,17 @@ Testing
 Unit tests are the lifeblood of the project, as it ensures that we can continue to add and
 change the code and stay confident that things have not broken. Running the tests requires
 ``pytest``, which is easily available through ``conda`` or ``pip``. Running the tests can be
-done via either:
+done by:
 
 .. parsed-literal::
-    python setup.py test
+    pytest tests
 
-or
-
-.. parsed-literal::
-    py.test
-
-Using ``py.test`` also gives you the option of passing a path to the directory with tests to
+This gives you the option of passing a path to the directory with tests to
 run, which can speed running only the tests of interest when doing development. For instance,
 to only run the tests in the ``siphon/cdmr`` directory, use:
 
 .. parsed-literal::
-    py.test siphon/cdmr
+    pytest siphon/cdmr
 
 ----------
 Code Style
@@ -142,7 +137,7 @@ To create a new release:
 3. (optional) Perform a ``git clean -f -x -d`` from the root of the repository. This will
    **delete** everything not tracked by git, but will also ensure clean source distribution.
    ``MANIFEST.in`` is set to include/exclude mostly correctly, but could miss some things.
-4. Run ``python setup.py sdist bdist_wheel`` (this requires ``wheel`` is installed).
+4. Run ``python -m build`` (this requires that ``build`` is installed).
 5. Upload using ``twine``: ``twine upload dist/*``, assuming the ``dist/`` directory contains
    only files for this release. This upload process will include any changes to the ``README``
-   as well as any updated flags from ``setup.py``.
+   as well as any updated flags from ``pyproject.toml``.

docs/installguide.rst

@@ -9,11 +9,10 @@ In general, Siphon tries to support minor versions of dependencies released with
 years. For Python itself, that means supporting the last two minor releases.
 
 Siphon currently supports the following versions of required dependencies:
-  - requests >= 1.2
-  - numpy >= 1.8.0
-  - protobuf >= 3.0.0
-  - beautifulsoup4>=4.6
-  - pandas
+
+.. literalinclude:: ../../pyproject.toml
+   :start-at: beautifulsoup4
+   :end-at: requests
 
 Installation Instructions for NumPy can be found at:
   https://numpy.org/install/
@@ -27,12 +26,7 @@ The easiest way to install Siphon is through ``pip``:
 .. parsed-literal::
     pip install siphon
 
-Siphon can also be installed through ``conda``:
-
-.. parsed-literal::
-    conda install -c unidata siphon
-
-Additionally, Siphon can be installed with ``conda-forge``:
+Siphon can also be installed through ``conda``, using the ``conda-forge`` channel:
 
 .. parsed-literal::
     conda install -c conda-forge siphon
@@ -41,7 +35,7 @@ The source code can also be grabbed from `GitHub <https://github.com/Unidata/sip
 the base of the source directory, run:
 
 .. parsed-literal::
-    python setup.py install
+    pip install .
 
 This will build and install Siphon into your current Python installation.