Update sphinx theme (#2031)

* Update requirements.txt

* Update conf.py

* Update conf.py

docs/requirements.txt

 sphinx==1.7.3
 sphinxcontrib-googleanalytics
--e git://github.com/snide/sphinx_rtd_theme.git#egg=sphinx_rtd_theme
+-e git+git://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch_sphinx_theme

docs/source/conf.py

@@ -22,7 +22,7 @@
 # sys.path.insert(0, os.path.abspath('.'))
 import torch
 import torchvision
-import sphinx_rtd_theme
+import pytorch_sphinx_theme
 
 
 # -- General configuration ------------------------------------------------
@@ -104,8 +104,8 @@ todo_include_todos = True
 # 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_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme = 'pytorch_sphinx_theme'
+html_theme_path = [pytorch_sphinx_theme.get_html_theme_path()]
 
 # 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
@@ -115,6 +115,7 @@ html_theme_options = {
     'collapse_navigation': False,
     'display_version': True,
     'logo_only': True,
+    'pytorch_project': 'docs',
 }
 
 html_logo = '_static/img/pytorch-logo-dark.svg'
@@ -125,12 +126,12 @@ html_logo = '_static/img/pytorch-logo-dark.svg'
 html_static_path = ['_static']
 
 # html_style_path = 'css/pytorch_theme.css'
-html_context = {
-    'css_files': [
-        'https://fonts.googleapis.com/css?family=Lato',
-        '_static/css/pytorch_theme.css'
-    ],
-}
+# html_context = {
+#    'css_files': [
+#        'https://fonts.googleapis.com/css?family=Lato',
+#        '_static/css/pytorch_theme.css'
+#    ],
+# }
 
 
 # -- Options for HTMLHelp output ------------------------------------------