change to alabaster theme

.rtd-environment.yml

@@ -6,3 +6,5 @@ dependencies:
   - mpi4py
   - six
   - joblib
+  - pip:
+    - alabaster

.travis.yml

@@ -41,6 +41,7 @@ install:
   - pip install mpi4py
   - pip install joblib
   - pip install coveralls
+  - pip install alabaster
   - pip install -vvv .
 
 before_script:

docs/conf.py

@@ -78,11 +78,7 @@
 # -- Options for HTML output ----------------------------------------------
 
 # Readthedocs.
-on_rtd = os.environ.get("READTHEDOCS", None) == "True"
-if not on_rtd:
-    import sphinx_rtd_theme
-    html_theme = "sphinx_rtd_theme"
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+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,