[PATCH] docs: conf.py: fix support for Readthedocs v 1.0.0

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

As described at:
	https://stackoverflow.com/questions/23211695/modifying-content-width-of-the-sphinx-theme-read-the-docs

since Sphinx 1.8, the standard way to setup a custom theme is
to use html_css_files. While using html_context is OK with RTD
0.5.2, it doesn't work with 1.0.0, causing the theme to not load,
producing a very weird html.

Tested with:
	- Sphinx 2.4.4 + sphinx-rtd-theme 0.5.2
	- Sphinx 2.4.4 + sphinx-rtd-theme 1.0.0
	- Sphinx 4.3.0 + sphinx-rtd-theme 1.0.0

Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/conf.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 17f7cee56987..7bc72be63fd2 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -249,11 +249,16 @@ except ImportError:
 
 html_static_path = ['sphinx-static']
 
-html_context = {
-    'css_files': [
+if major <= 1 and (minor < 8):
+    html_context = {
+        'css_files': [
+            '_static/theme_overrides.css',
+        ],
+    }
+else:
+    html_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
-- 
2.33.1