Fix Docs static analysis (#708)

* remove ref to old script in static analysis

* update README with doc build instructions

update gitignore with doc artifacts

[ROCm/rccl commit: 8c56e6c892]

projects/rccl/.gitignore

@@ -1,4 +1,12 @@
 # Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
-/build
 *.gcov
 /coverage/
+
+# documentation artifacts
+build/
+_build/
+_images/
+_static/
+_templates/
+_toc.yml
+docBin/