Back to the DITA syntax error with own ditamap
Remove duplicative comments
Consolidate sed invocations
Switch to htmlhelp instead of html5
Remove unused stuff from Dockerfile
Move Vim line up

It rarely changes during development
Oracle instead of openjdk

Also, run unit tests to make sure we're compatible.
Use new default ant target

It consolidates the lines replaced here.
Use xml-resolver instead of resolver.jar
Remove 'joke'