Revert "Change the plugin folder name. "com.antennahouse.pdf5 folder" -> "pub.yanmo.html5""

This reverts commit 7f8f9e1c2c9ad704db6f444437bd747e30cb2cd7.
delete the unnecessary files, and change the plugin folder name.
"com.antennahouse.pdf5" -> "gen.dita.html5"