🔧 Add notfound extension

Author: veit

docs/404.rst

@@ -0,0 +1,8 @@
+====================
+Seite nicht gefunden
+====================
+
+Diese Seite ist möglicherweise verschoben worden.
+
+Bitte wählt eine Seite aus dem Seitenmenü oder besucht unsere Homepage unter
+https://www.python4data.science/de/latest/.

docs/conf.py

@@ -48,17 +48,18 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    "nbsphinx",
     "IPython.sphinxext.ipython_console_highlighting",
-    # 'jupyter_sphinx.execute',
+    # "jupyter_sphinx.execute",
+    "nbsphinx",
+    "notfound.extension",
     "sphinx.ext.autodoc",
-    "sphinx.ext.intersphinx",
     "sphinx.ext.graphviz",
+    "sphinx.ext.intersphinx",
     "sphinx.ext.todo",
-    "sphinxcontrib.cairosvgconverter",
-    "sphinxext.opengraph",
     "sphinx_copybutton",
     "sphinx_inline_tabs",
+    "sphinxcontrib.cairosvgconverter",
+    "sphinxext.opengraph",
 ]
 
 # Add any paths that contain templates here, relative to this directory.

pyproject.toml

@@ -20,18 +20,19 @@ dependencies = []
 
 [project.optional-dependencies]
 docs = [
-    "sphinx<8.2",
     "furo",
     "ipython",
     "ipywidgets",
+    "matplotlib",
     "nbsphinx",
     "notebook",
-    "sphinxcontrib-svg2pdfconverter",
-    "sphinxext.opengraph", # matplotlib is required for social cards
-    "matplotlib",
+    "sphinx<8.2",
     "sphinx-copybutton",
-    "sphinx_inline_tabs",
     "sphinx-lint",
+    "sphinx-notfound-page",
+    "sphinx_inline_tabs",
+    "sphinxcontrib-svg2pdfconverter",
+    "sphinxext.opengraph", # matplotlib is required for social cards
 ]
 
 dev = [