dependency-groups.dev and uv in docs (#691)

* dependency-groups.dev and switch to uv in docs
* Separate dependency group for docs

.github/workflows/spellcheck.yml

@@ -15,7 +15,7 @@ jobs:
         cache-dependency-path: pyproject.toml
     - name: Install dependencies
       run: |
-        pip install -e '.[docs]'
+        pip install . --group docs
     - name: Check spelling
       run: |
         codespell docs/*.rst --ignore-words docs/codespell-ignore-words.txt