ci: fix docs build

Author: parthea

noxfile.py

@@ -206,7 +206,7 @@ def blacken(session):
 def docs(session):
     """Build the docs."""
 
-    session.install("ipython", "recommonmark", "sphinx", "sphinx_rtd_theme")
+    session.install("ipython", "recommonmark", "sphinx<3.0.0", "sphinx_rtd_theme")
     session.install("google-cloud-storage")
     session.install("-e", ".[all]")
 
@@ -223,36 +223,3 @@ def docs(session):
         os.path.join("docs", ""),
         os.path.join("docs", "_build", "html", ""),
     )
-
-
-@nox.session(python="3.8")
-def docfx(session):
-    """Build the docfx yaml files for this library."""
-
-    session.install("-e", ".")
-    session.install("sphinx", "alabaster", "recommonmark", "sphinx-docfx-yaml")
-
-    shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
-    session.run(
-        "sphinx-build",
-        "-T",  # show full traceback on exception
-        "-N",  # no colors
-        "-D",
-        (
-            "extensions=sphinx.ext.autodoc,"
-            "sphinx.ext.autosummary,"
-            "docfx_yaml.extension,"
-            "sphinx.ext.intersphinx,"
-            "sphinx.ext.coverage,"
-            "sphinx.ext.napoleon,"
-            "sphinx.ext.todo,"
-            "sphinx.ext.viewcode,"
-            "recommonmark"
-        ),
-        "-b",
-        "html",
-        "-d",
-        os.path.join("docs", "_build", "doctrees", ""),
-        os.path.join("docs", ""),
-        os.path.join("docs", "_build", "html", ""),
-    )