🔧 MAINTAIN: Update metadata classifiers

Author: chrisjsewell

setup.cfg

@@ -10,7 +10,7 @@ author_email = [email protected]
 license = MIT
 license_file = LICENSE
 classifiers =
-    Development Status :: 3 - Alpha
+    Development Status :: 4 - Beta
     Framework :: Sphinx :: Extension
     Intended Audience :: Developers
     License :: OSI Approved :: MIT License
@@ -22,6 +22,8 @@ classifiers =
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Software Development :: Libraries :: Python Modules
     Topic :: Text Processing :: Markup
+    Topic :: Text Processing :: Markup :: Markdown
+    Topic :: Text Processing :: Markup :: reStructuredText
 keywords = sphinx extension material design web components
 project_urls =
     Documentation = https://sphinx-design.readthedocs.io