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diff -up ./doc/advanced/content/conf.py.sphinx ./doc/advanced/content/conf.py
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--- ./doc/advanced/content/conf.py.sphinx	2020-05-11 04:59:26.000000000 -0400
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+++ ./doc/advanced/content/conf.py	2020-06-07 16:11:04.398144850 -0400
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@@ -4,7 +4,7 @@
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 # -- General configuration -----------------------------------------------------
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 # Add any Sphinx extension module names here, as strings. They can be extensions
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 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
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-extensions = ['sphinx.ext.imgmath', 'sphinxcontrib.doxylink.doxylink']
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+extensions = ['sphinx.ext.imgmath']
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 # Add any paths that contain templates here, relative to this directory.
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 # templates_path = ['_templates']
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@@ -69,7 +69,7 @@ pygments_style = 'sphinx'
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 # The theme to use for HTML and HTML Help pages.  Major themes that come with
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 # Sphinx are currently 'default' and 'sphinxdoc'.
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-html_theme = 'sphinx_rtd_theme'
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+html_theme = 'sphinxdoc'
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 # Theme options are theme-specific and customize the look and feel of a theme
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 # further.  For a list of options available for each theme, see the
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diff -up ./doc/tutorials/content/conf.py.sphinx ./doc/tutorials/content/conf.py
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--- ./doc/tutorials/content/conf.py.sphinx	2020-05-11 04:59:26.000000000 -0400
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+++ ./doc/tutorials/content/conf.py	2020-06-07 16:10:46.555225064 -0400
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@@ -4,7 +4,7 @@
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 # -- General configuration -----------------------------------------------------
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 # Add any Sphinx extension module names here, as strings. They can be extensions
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 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
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-extensions = ['sphinx.ext.imgmath', 'sphinxcontrib.doxylink.doxylink']
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+extensions = ['sphinx.ext.imgmath']
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 imgmath_dvipng_args = ['-gamma', '1.5', '-D', '110', '-bg', 'Transparent']
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 # Add any paths that contain templates here, relative to this directory.
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@@ -70,7 +70,7 @@ pygments_style = 'sphinx'
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 # The theme to use for HTML and HTML Help pages.  Major themes that come with
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 # Sphinx are currently 'default' and 'sphinxdoc'.
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-html_theme = 'sphinx_rtd_theme'
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+html_theme = 'sphinxdoc'
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 # Theme options are theme-specific and customize the look and feel of a theme
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 # further.  For a list of options available for each theme, see the