0.3.2: documentation build fsils because missing `sphinx_examples` module

[kloczek]

Describe the bug

Cannot find sphinx_examples on pypi.

+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v5.0.2
WARNING: Invalid configuration value found: 'language = None'. Update your configuration to a valid langauge code. Falling back to 'en' (English).

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/registry.py", line 430, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'sphinx_examples'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/cmd/build.py", line 272, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 223, in __init__
    self.setup_extension(extension)
  File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 380, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib/python3.8/site-packages/sphinx/registry.py", line 433, in load_extension
    raise ExtensionError(__('Could not import extension %s') % extname,
sphinx.errors.ExtensionError: Could not import extension sphinx_examples (exception: No module named 'sphinx_examples')

Extension error:
Could not import extension sphinx_examples (exception: No module named 'sphinx_examples')

BTW: you removed man_pages from docs/conf.py.
I'm uning it.

Reproduce the bug

• Checkout sphinx-togglebutton repo
• apply below patch

--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,3 +1,7 @@
+import os
+import sys
+sys.path.insert(0, os.path.abspath(".."))
+
 # -- Project information -----------------------------------------------------

 project = "Sphinx Toggle Button"

• run in project root /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man

List your environment

list of modules installed in build env

Package                       Version
----------------------------- -----------------
alabaster                     0.7.12
appdirs                       1.4.4
asttokens                     2.0.5
attrs                         22.1.0.dev0
Babel                         2.10.2
backcall                      0.2.0
Brlapi                        0.8.3
build                         0.8.0
charset-normalizer            2.1.0
click                         8.1.2
codespell                     2.1.0
cssselect                     1.1.0
cycler                        0.11.0
debugpy                       1.6.2
decorator                     5.1.1
distro                        1.7.0
docutils                      0.17.1
entrypoints                   0.4
executing                     0.8.3
extended-project              1.2.3
extras                        1.0.0
fastjsonschema                2.15.3
fixtures                      4.0.0
fonttools                     4.34.4
gpg                           1.17.1-unknown
greenlet                      1.1.2
idna                          3.3
imagesize                     1.4.1
importlib-metadata            4.12.0
importlib-resources           5.8.0
iniconfig                     1.1.1
ipykernel                     6.15.1
ipython                       8.4.0
jedi                          0.18.1
Jinja2                        3.1.1
jsonschema                    4.7.2
jupyter-cache                 0.5.0
jupyter-client                7.3.4
jupyter-core                  4.11.1
kiwisolver                    1.4.3
libcomps                      0.1.18
louis                         3.22.0
lxml                          4.9.1
markdown-it-py                2.1.0
MarkupSafe                    2.1.1
matplotlib                    3.5.2
matplotlib-inline             0.1.3
mdit-py-plugins               0.3.0
mdurl                         0.1.1
myst-nb                       0.15.0
myst-parser                   0.17.2
nbclient                      0.6.6
nbformat                      5.4.0
nest-asyncio                  1.5.5
numpy                         1.23.1
olefile                       0.46
packaging                     21.3
parso                         0.8.3
pbr                           5.8.1
pep517                        0.12.0
pexpect                       4.8.0
pickleshare                   0.7.5
Pillow                        9.2.0
pip                           22.0.4
pluggy                        1.0.0
prompt-toolkit                3.0.29
psutil                        5.9.0
ptyprocess                    0.7.0
pure-eval                     0.2.2
py                            1.11.0
Pygments                      2.12.0
PyGObject                     3.42.1
pyparsing                     3.0.9
pyrsistent                    0.18.1
pytest                        7.1.2
python-dateutil               2.8.2
pytz                          2022.1
PyYAML                        6.0
pyzmq                         23.2.0
requests                      2.28.1
rpm                           4.17.0
scour                         0.38.2
setuptools                    63.2.0
simple-project                1.2.3
six                           1.16.0
snowballstemmer               2.2.0
Sphinx                        5.0.2
sphinx-togglebutton           0.3.1
sphinxcontrib-applehelp       1.0.2.dev20220714
sphinxcontrib-devhelp         1.0.2.dev20220714
sphinxcontrib-htmlhelp        2.0.0
sphinxcontrib-jsmath          1.0.1.dev20220712
sphinxcontrib-qthelp          1.0.3.dev20220712
sphinxcontrib-serializinghtml 1.1.5
SQLAlchemy                    1.4.39.dev0
stack-data                    0.3.0
tabulate                      0.8.9
testtools                     2.5.0
tomli                         2.0.1
tornado                       6.1
traitlets                     5.3.0
typing_extensions             4.2.0
urllib3                       1.26.9
wcwidth                       0.2.5
wheel                         0.37.1
zipp                          3.8.1