automatic re-deploy on merge into master

re-deploying the website is currently a manual process performed by @jjpr-mit.
The preferred automated solution would be to have an action that triggers a re-deploy every time master is updated.

Start by inspecting the repository for its deployment configuration and the entry point used for the current manual website redeploy. Define the workflow trigger for updates to master and verify that a merge causes the same deployment process to run successfully.

Written by the indexing model from the issue text.