Incorportate W2W into docs style

docs/source/_static/w2w.css

+div.related {
+    background-color: #2D338A;
+}
+div.related a {
+    color: #EEE;
+}
+div.body {
+    max-width: 900px;
+}
+div.body h1, div.body h2 {
+    background-color: #DDD;
+}
+p.logo {
+    margin-top: 0;
+}
+a {
+    color: #2D338A;
+}
+a:hover {
+    color: #4261AC;
+}
+

docs/source/conf.py

@@ -52,6 +52,12 @@ exclude_patterns = []
 #
 html_theme = 'nature'
 
+html_css_files = [
+    "w2w.css"
+]
+
+html_logo = "_static/w2w.png"
+
 # 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".