One related question: I can create /extraWebapp and deploy index.html to it. If I directly request this file (i.e. https://myserver.com/index.html), it works. If I request "https://myserver.com", it redirects to /home/begin.view. What controls the latter?

Also - to my earlier question, it appears a module can supply top-level files in /web, like index.html. so it seems that I could deploy content automatically through a module.