Fix links.

This PR changes links from http://0.0.0.0:4567/#show-project to http://0.0.0.0:4567/#show-project-v4. This way we can have links to different versions of the APIs, e.g.:
- http://0.0.0.0:4567/#show-project-v3
- http://0.0.0.0:4567/#show-project-v4