Revert docs/usermanual/html addition, since newer git seems to pick up the docs/usermanual/.gitignore entry correctly.
Revert docs/usermanual/html addition, since newer git seems to pick up
the docs/usermanual/.gitignore entry correctly.

anguslees/openembedded-android,anguslees/openembedded-android,anguslees/openembedded-android,anguslees/openembedded-android,anguslees/openembedded-android,anguslees/openembedded-android,anguslees/openembedded-android