contrib.js and registration.js to man.js

[nsano-rururu]

• [x] main.js
• [x] tests/unit/setup.js
• [x] delete contrib.js
• [x] delete registration.js

[nsano-rururu]

https://github.com/johnsusek/praeco/commit/3f55b4e941f3437b1db7fc4c21c5297e38ce7d9c