[ci skip] Switch docs to the alabaster theme

docs/_static/custom.css

@@ -0,0 +1,3 @@
+body div.sphinxsidebarwrapper p.logo {
+    text-align: left;
+}

docs/conf.py

@@ -96,19 +96,44 @@ source_suffix = ['.rst', '.md']
 # 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 = 'alabaster'
 
 # 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
 # documentation.
 #
-# html_theme_options = {}
+html_theme_options = {
+    'description': "Jupyter Docker Stacks",
+    'fixed_sidebar': False,
+    'show_relbars': True,
+    'github_user': 'jupyter',
+    'github_repo': 'docker-stacks',
+    'github_type': 'star',
+    'logo': 'jupyter-logo.png',
+    'logo_text_align': 'left'
+}
 
 # 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 = ['_static']
 
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+#
+html_sidebars = {
+    '**': [
+        'about.html',
+        'navigation.html',
+        'relations.html',
+        'searchbox.html',
+    ]
+}
 
 # -- Options for HTMLHelp output ------------------------------------------