lichess.org/api doc inner links are all broken

[ornicar]

since we changed the openapi renderer, all internal links (from an endpoint to another) are broken.

Example:

• https://lichess.org/api#tag/games/POST/api/stream/games/{streamId}
• click add new game IDs to watch
• it should land on https://lichess.org/api#tag/games/POST/api/stream/games/{streamId}/add but doesn't

[GhadiSaab]

Hey, I made a PR for this issue. Check it out when you have time.