Automatically update Javadoc with GitHub Actions

[ayvacs]

Judging on commit history, the Javadoc was last updated four years ago. It's over 300 commits behind.

You can use Deploy Publish Javadoc to automatically build and publish the Javadoc to GitHub Pages whenever a commit is made to the master branch. It's very easy to set up and configure.

[stleary]

@ayvacs Thanks for the reminder. I checked out https://github.com/MathieuSoysal/Javadoc-publisher.yml and it does not appear to be widely used at this time. Instead, I added javadoc publishing instructions to the release instructions in the Wiki.