Bug 1413975 - Docs: Disable unused Sphinx extensions

This means less to both install and run at build time, hopefully
speeding up the build and reducing the chance of races/locking issues.

docs/conf.py

@@ -12,33 +12,13 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import os
-import sys
-
 import sphinx_rtd_theme
 
-# 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.
-sys.path.insert(0, os.path.abspath('..'))
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "treeherder.config.settings")
-
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
 # needs_sphinx = '1.0'
 
-# Add any Sphinx extension module names here, as strings. They can be
-# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
-# ones.
-extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.doctest',
-    'sphinx.ext.coverage',
-    'sphinx.ext.viewcode',
-    'sphinxcontrib.httpdomain',
-]
-
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 

requirements/docs.txt

@@ -1,12 +1,7 @@
 # Dependencies for building the documentation, intended to be used standalone
 # since doc generation does not need all of the requirements in common.txt.
-# These are intentionally not version-pinned & have implicit dependencies,
-# since otherwise we play tug of war with the Read the Docs build process
-# every time they update Sphinx versions. If this file were just for Read the
-# Docs, we could omit the Sphinx entry since they provide it, however that
-# would not help those who wish to build the docs locally.
+# This file is used by Read the Docs, Travis and when building locally.
 
 Sphinx==1.6.5
 sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.2.4
-sphinxcontrib-httpdomain==1.5.0