Remove unused bundle/docsgen directory

The docsgen package is no longer used anywhere. Remove it along with
its .wsignore exclusion entries.

Co-authored-by: Isaac

Author: shreyas-goenka

.wsignore

@@ -27,8 +27,3 @@ python/databricks/bundles/*/_models/*.py
 
 # Developed elsewhere:
 internal/genkit/tagging.py
-
-# Docsgen:
-bundle/docsgen/output/resources.md
-bundle/docsgen/output/reference.md
-bundle/docsgen/testdata/anchors.md