Inconsistent package names

[gerardcanal]

Hi there, I was trying out the ros-vosk, and I found some package names are inconsistent (it is called ros_vosk in some places and vosk_ros in others, I guess due to the port from https://github.com/a-prototype/vosk_ros (I understand this repo will take over @a-prototype 's one).

On another note, it might be good to put the installing line as "https://github.com/alphacep/ros-vosk.git ros_vosk". Otherwise, there are issues with the folder named ros-vosk and the package ros_vosk.