get rid of requirements-mkdocs.txt

.github/workflows/mkdocs-material.yml

@@ -19,11 +19,13 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: '3.10'
+          cache: pip
+          cache-dependency-path: pyproject.toml
 
       - name: install requirements
         run: |
           python -m \
-            pip install -r docs/requirements-mkdocs.txt
+            pip install ".[docs]"
 
       - name: confirm buildability
         run: |

docs/requirements-mkdocs.txt

@@ -1,3 +0,0 @@
-mkdocs-material==9.*
-mkdocs-git-revision-date-localized-plugin
-mkdocs-redirects==1.2.0