Now that docToolchain handles your docs like your code, the next logical step is to add some automated tests.
It is a gradle plugin which does some quality checks on a generated HTML document. Since it is well documented, I will not waste your time by writing something which is already written on the project page.
The htmlSanityCheck is now the last default task for docToolchain and creates a report which looks like this:
As always, the updated code is already on github: docToolchain