conf.py: Exclude files out of the build process

* experimental will be dropped soon
* README.rst - is only meant as entry point
* project.rst - is only meant for CONTRIBUTING template

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

conf.py

@@ -30,7 +30,6 @@ release = '1.0'
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'recommonmark'
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -46,7 +45,7 @@ language = 'y'
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = []
+exclude_patterns = ['README.rst', 'contributing/project.rst', 'experimental']
 
 
 # -- Options for HTML output -------------------------------------------------