Add docs deployment action

[shreyasminocha]

Fixes #43.

Just set up a little GH pages site for ricesec and thought I'd add this in. Tested it with my fork and it looks like this. Merging the PR should do everything automatically and deploy to /ElectionGuard-TypeScript once a public danwallach/danwallach.github.io repo exists.

Does this:

every commit updates a static GitHub Pages site.

…but not this:

only do this if the unit tests pass