fixing the build scripts for documentation (#711)

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-342.local>

docs/build_docs.sh

@@ -2,6 +2,8 @@ docker build -f docs/Dockerfile . -t sphinx
 
 # Clean build output locally
 rm -rf docs/build
+mkdir -p docs/build
+chmod -R 777 docs/build
 
 # Run make clean/html while keeping provider_models.yaml from the image
 docker run --user $(id -u):$(id -g) --rm \