Reduce content in the sphinx-quickstart conf.py file

This makes the file be simpler whenever possible, reducing the amount of
explanation and commented behaviour provided in the `conf.py` file
generated by `sphinx-quickstart`.

sphinx/templates/quickstart/conf.py_t

@@ -1,119 +1,71 @@
 # Configuration file for the Sphinx documentation builder.
 #
-# This file only contains a selection of the most common options. For a full
-# list see the documentation:
+# For the full list of built-in configuration values, see the documentation:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
 
+{% if append_syspath -%}
 # -- Path setup --------------------------------------------------------------
 
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#
-{% if append_syspath -%}
 import os
 import sys
 sys.path.insert(0, {{ module_path | repr }})
-{% else -%}
-# import os
-# import sys
-{% if module_path -%}
-# sys.path.insert(0, {{ module_path | repr }})
-{% else -%}
-# sys.path.insert(0, os.path.abspath('.'))
-{% endif -%}
-{% endif %}
 
+{% endif -%}
 # -- Project information -----------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
 
 project = {{ project | repr }}
 copyright = {{ copyright | repr }}
 author = {{ author | repr }}
 
 {%- if version %}
 
-# The short X.Y version
 version = {{ version | repr }}
 {%- endif %}
 {%- if release %}
-
-# The full version, including alpha/beta/rc tags
 release = {{ release | repr }}
 {%- endif %}
 
-
 # -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-# Add any Sphinx extension module names here, as strings. They can be
-# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
-# ones.
-extensions = [
+extensions = [{% if extensions %}
 {%- for ext in extensions %}
     '{{ ext }}',
 {%- endfor %}
-]
+{% endif %}]
 
-# Add any paths that contain templates here, relative to this directory.
 templates_path = ['{{ dot }}templates']
+exclude_patterns = [{{ exclude_patterns }}]
 
 {% if suffix != '.rst' -%}
-# The suffix(es) of source filenames.
-# You can specify multiple suffix as a list of string:
-#
-# source_suffix = ['.rst', '.md']
 source_suffix = {{ suffix | repr }}
-
 {% endif -%}
+
 {% if root_doc != 'index' -%}
-# The root document.
 root_doc = {{ root_doc | repr }}
-
 {% endif -%}
+
 {% if language -%}
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#
-# This is also used if you do content translation via gettext catalogs.
-# Usually you set "language" from the command line for these cases.
 language = {{ language | repr }}
-
-{% endif -%}
-# List of patterns, relative to source directory, that match files and
-# directories to ignore when looking for source files.
-# This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = [{{ exclude_patterns }}]
-
+{%- endif %}
 
 # -- Options for HTML output -------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-#
 html_theme = 'alabaster'
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['{{ dot }}static']
-{%- if extensions %}
-
-
-# -- Extension configuration -------------------------------------------------
-{%- endif %}
-{%- if 'sphinx.ext.intersphinx' in extensions %}
-
+{% if 'sphinx.ext.intersphinx' in extensions %}
 # -- Options for intersphinx extension ---------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html#configuration
 
-# Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3', None),
 }
-
-{%- endif %}
-{%- if 'sphinx.ext.todo' in extensions %}
-
+{% endif -%}
+{% if 'sphinx.ext.todo' in extensions %}
 # -- Options for todo extension ----------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/extensions/todo.html#configuration
 
-# If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = True
-{%- endif %}
+{% endif %}