Index: doc/en/conf.py
--- doc/en/conf.py.orig
+++ doc/en/conf.py
@@ -27,24 +27,11 @@ release = ".".join(version.split(".")[:2])
 
 root_doc = "index"
 extensions = [
-    "pygments_pytest",
     "sphinx.ext.autodoc",
     "sphinx.ext.autosummary",
-    "sphinx.ext.intersphinx",
     "sphinx.ext.todo",
     "sphinx.ext.viewcode",
-    "sphinx_removed_in",
-    "sphinxcontrib_trio",
-    "sphinxcontrib.towncrier.ext",  # provides `towncrier-draft-entries` directive
-    "sphinx_issues",  # implements `:issue:`, `:pr:` and other GH-related roles
 ]
-
-# Building PDF docs on readthedocs requires inkscape for svg to pdf
-# conversion. The relevant plugin is not useful for normal HTML builds, but
-# it still raises warnings and fails CI if inkscape is not available. So
-# only use the plugin if inkscape is actually available.
-if shutil.which("inkscape"):
-    extensions.append("sphinxcontrib.inkscapeconverter")
 
 exclude_patterns = [
     "_build",
