Add make target "docs" to create current branch

We've been seeing issues with sphinx-multiversion not building the
docs with the imported repos. sphinx-build still works as expected,
and we don't have a very strong need for multiversion builds.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: Iab726bb365970a58746204980b21d595232204ba
diff --git a/sphinx_conf/exclude_patterns.py b/sphinx_conf/exclude_patterns.py
index 3c5fade..3bdeafe 100644
--- a/sphinx_conf/exclude_patterns.py
+++ b/sphinx_conf/exclude_patterns.py
@@ -20,6 +20,9 @@
     'cord-tester/src',
     'cord-tester/README.md',
     'cord-tester/cord-robot/README.rst',
+    'lf',
+    'makesfiles',
+    'makefiles-orig',
     'openolt/agent/*',
     'repos',
     'requirements.txt',