[COMMITTED] ada: doc/share/conf.py: Switch the HTML documentation to using the RTD theme

[COMMITTED] ada: doc/share/conf.py: Switch the HTML documentation to using the RTD theme

[Marc Poulhiès]

From: Joel Brobecker <brobecker@adacore.com>

This commit adjust the sphinx configuration to use the "Read The Docs"
theme, which has the advantage of allowing the navigation bar
(containing among other things a search bar, and the TOC) to stay
fixed while scrolling the contents of the page being read. This is
particularly useful to allow access to those features while reading
a long page, for instance.

gcc/ada/

	* doc/share/conf.py (extensions): Add 'sphinx_rtd_theme'.
	(html_theme): Set to 'sphinx_rtd_theme'.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/doc/share/conf.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/doc/share/conf.py b/gcc/ada/doc/share/conf.py
index bb36bfa0c6a..9ab80e7759e 100644
--- a/gcc/ada/doc/share/conf.py
+++ b/gcc/ada/doc/share/conf.py
@@ -92,7 +92,7 @@ if doc_name == 'gnat_rm':
     exclude_patterns.append('share/gnat_project_manager.rst')
     print('ignoring share/gnat_project_manager.rst')
 
-extensions = []
+extensions = ['sphinx_rtd_theme']
 templates_path = ['_templates']
 source_suffix = '.rst'
 master_doc = doc_name
@@ -107,7 +107,7 @@ release = get_gnat_version()
 
 pygments_style = None
 tags.add(get_gnat_build_type())
-html_theme = 'sphinxdoc'
+html_theme = 'sphinx_rtd_theme'
 if os.path.isfile('adacore_transparent.png'):
     html_logo = 'adacore_transparent.png'
 if os.path.isfile('favicon.ico'):
-- 
2.34.1