doc-rst: boilerplate HTML theme customization

Implements the minimal boilerplate for Sphinx HTML theme customization.
Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/conf.py

@@ -176,7 +176,14 @@ except ImportError:
 # 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']
+
+html_static_path = ['sphinx-static']
+
+html_context = {
+    'css_files': [
+        '_static/theme_overrides.css',
+    ],
+}
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied

Documentation/sphinx-static/theme_overrides.css

+/* -*- coding: utf-8; mode: css -*-
+ *
+ * Sphinx HTML theme customization
+ *
+ */
+
+@media screen {
+
+}