Install latest theme (#2866)

* Install latest theme in the build.sh so that we can pull the latest sphinx theme when needed.

Author: svekars

.jenkins/build.sh

@@ -56,7 +56,8 @@ if [[ "${JOB_TYPE}" == "worker" ]]; then
   # Files to run must be accessible to subprocessed (at least to `download_data.py`)
   export FILES_TO_RUN
 
-  # Step 3: Run `make docs` to generate HTML files and static files for these tutorials
+  # Step 3: Run `make docs` to generate HTML files and static files for these tutorialis
+  pip3 install -e git+https://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch_sphinx_theme
   make docs
 
   # Step 3.1: Run the post-processing script:
@@ -118,6 +119,7 @@ if [[ "${JOB_TYPE}" == "worker" ]]; then
   awsv2 s3 cp worker_${WORKER_ID}.7z s3://${BUCKET_NAME}/${COMMIT_ID}/worker_${WORKER_ID}.7z
 elif [[ "${JOB_TYPE}" == "manager" ]]; then
   # Step 1: Generate no-plot HTML pages for all tutorials
+  pip3 install -e git+https://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch_sphinx_theme
   make html-noplot
   cp -r _build/html docs