[libgpiod][PATCH] doc: fix sphinx config for rtd

[Kent Gibson <warthog618@xxxxxxxxx>]

Generating the latest documentation on readthedocs is broken as the
index.html generated by Doxygen is now being overwritten by one
generated by Sphinx.

Make Sphinx generate a differently named root page that does not
conflict with the index.html generated by Doxygen.

Signed-off-by: Kent Gibson <warthog618@xxxxxxxxx>
---
 sphinx/conf.py                     | 2 ++
 sphinx/{index.rst => contents.rst} | 0
 2 files changed, 2 insertions(+)
 rename sphinx/{index.rst => contents.rst} (100%)

diff --git a/sphinx/conf.py b/sphinx/conf.py
index 51ae3e9..043dc79 100644
--- a/sphinx/conf.py
+++ b/sphinx/conf.py
@@ -53,6 +53,8 @@ exclude_patterns = []
 
 # -- Options for HTML output -------------------------------------------------
 
+root_doc = 'contents'
+
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
diff --git a/sphinx/index.rst b/sphinx/contents.rst
similarity index 100%
rename from sphinx/index.rst
rename to sphinx/contents.rst
-- 
2.39.2