MAINT: Remove dead configuration from setup.cfg (py-pdf#2040)

Now that we use `flit` for building the packages, we have the `pyproject.toml` as the ground truth (see py-pdf#1382).

This PR removes the duplicated data from the `setup.cfg` to avoid confusion. Only the name of the license is additionally added to the docs to simplify peoples lives.

Author: MartinThoma

docs/meta/faq.md

@@ -53,3 +53,7 @@ In BibTeX format:
  note          = {See https://pypdf.readthedocs.io/en/latest/meta/CONTRIBUTORS.html for all contributors}
 }
 ```
+
+## Which License does pypdf use?
+
+`pypdf` uses the [BSD-3-Clause license](https://en.wikipedia.org/wiki/BSD_licenses#3-clause), see the LICENSE file.

setup.cfg

@@ -1,52 +1,3 @@
-[metadata]
-name = pypdf
-
-author = Mathieu Fenniak
-author_email = biziqe@mathieu.fenniak.net
-maintainer = Martin Thoma
-maintainer_email = info@martin-thoma.de
-
-description = A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files
-long_description = file: README.md
-long_description_content_type = text/markdown
-
-license = BSD-3-Clause
-
-url = https://pypdf.readthedocs.io/en/latest/
-project_urls =
-    Source = https://github.com/py-pdf/pypdf
-    Bug Reports = https://github.com/py-pdf/pypdf/issues
-    Changelog = https://pypdf.readthedocs.io/en/latest/meta/CHANGELOG.html
-classifiers =
-    Development Status :: 5 - Production/Stable
-    Intended Audience :: Developers
-    License :: OSI Approved :: BSD License
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.11
-    Operating System :: OS Independent
-    Topic :: Software Development :: Libraries :: Python Modules
-    Typing :: Typed
-
-[options]
-packages =
-    pypdf
-    pypdf._codecs
-    pypdf.generic
-python_requires = >=3.6
-install_requires =
-    typing_extensions >= 3.10.0.0; python_version < '3.10'
-    dataclasses; python_version < '3.7'
-
-[options.extras_require]
-full = PyCryptodome; Pillow
-crypto = PyCryptodome
-image = Pillow
-
 [mutmut]
 backup = False
 runner = ./mutmut-test.sh