Make docs builds less verbose (#1302)

This PR adds the `--no-progress` flag to reduce verbose output from the `s3 sync` commands.

Authors:
  - Jake Awe (https://github.com/AyodeAwe)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: #1302

ci/build_docs.sh

@@ -45,6 +45,6 @@ popd
 
 if [[ ${RAPIDS_BUILD_TYPE} == "branch" ]]; then
   rapids-logger "Upload Docs to S3"
-  aws s3 sync --delete docs/_html "s3://rapidsai-docs/raft/${VERSION_NUMBER}/html"
-  aws s3 sync --delete docs/_text "s3://rapidsai-docs/raft/${VERSION_NUMBER}/txt"
+  aws s3 sync --no-progress --delete docs/_html "s3://rapidsai-docs/raft/${VERSION_NUMBER}/html"
+  aws s3 sync --no-progress --delete docs/_text "s3://rapidsai-docs/raft/${VERSION_NUMBER}/txt"
 fi