diff --git a/docs/conf.py b/docs/conf.py
index 469717eb..45e952dd 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -19,12 +19,9 @@
 exclude_patterns = ["_build"]
 extensions = [
     "myst_parser",  # https://myst-parser.readthedocs.io
-    "sphinx.ext.autodoc",
-    "sphinx.ext.extlinks",
-    "sphinx.ext.intersphinx",
     "sphinx_imgur.imgur",  # https://sphinx-imgur.readthedocs.io
-    "sphinx_sitemap",  # https://github.com/jdillard/sphinx-sitemap
-    "sphinxcontrib.youtube",  # https://github.com/sphinx-contrib/youtube
+    "sphinx_sitemap",  # https://sphinx-sitemap.readthedocs.io
+    "sphinxcontrib.youtube",  # https://sphinxcontrib-youtube.readthedocs.io
     "ablog",  # https://ablog.readthedocs.io/
 ]
 language = "en"
@@ -169,37 +166,6 @@
 sitemap_url_scheme = "{link}"
 
 
-def parse_event(env, sig, signode):
-    event_sig_re = re.compile(r"([a-zA-Z-]+)\s*\((.*)\)")
-    m = event_sig_re.match(sig)
-    if not m:
-        signode += addnodes.desc_name(sig, sig)
-        return sig
-    name, args = m.groups()
-    signode += addnodes.desc_name(name, name)
-    plist = addnodes.desc_parameterlist()
-    for arg in args.split(","):
-        arg = arg.strip()
-        plist += addnodes.desc_parameter(arg, arg)
-    signode += plist
-    return name
-
-
-def setup(app):
-    from sphinx.ext.autodoc import cut_lines
-    from sphinx.util.docfields import GroupedField
-
-    app.connect("autodoc-process-docstring", cut_lines(4, what=["module"]))
-    app.add_object_type(
-        "confval",
-        "confval",
-        objname="configuration value",
-        indextemplate="pair: %s; configuration value",
-    )
-    fdesc = GroupedField("parameter", label="Parameters", names=["param"], can_collapse=True)
-    app.add_object_type("event", "event", "pair: %s; event", parse_event, doc_field_types=[fdesc])
-
-
 """
 TODOs:
 * Diff: support multiple branches? Store in git lfs or artifacts? Cleanup after n days?