Revert "fix(ng-doc/component-groups-generate processor): use path/outputPath specified in processing.api-docs"

This reverts commit f2c3776f8660ab92810e0b940e74a8c74180f755.

This caused a breaking change to the code, which is not wanted in 0.9.x
branch. The feature can be achieved without a breaking change.
fix(ng-doc/component-groups-generate): allow path/outputPath to be configurable

You can now configure the path and outputPath of the component groups documents.

See #50
chore(package.json): release v0.9.5