Typo

# The theme to use for HTML and HTML Help pages.  See the documentation for

# a list of builtin themes.

html_theme = 'sphinx-rtd-theme'

html_theme = 'sphinx_rtd_theme'

# Theme options are theme-specific and customize the look and feel of a theme

# further.  For a list of options available for each theme, see the

sphinx>=3.2

django<4.2

sphinx-rtd-theme

sphinx_rtd_theme