Summary:
When using baseUrl in site config, it adds a prefix to all link paths.
But for assets, it doesn't work if you refer to them as `docs/assets/...`, you have to use just `assets/...`. Source: https://github.com/facebook/Docusaurus/issues/861
Reviewed By: passy
Differential Revision: D20796933
fbshipit-source-id: 2346e42b8b548f576a1e143f56ee5236eab55073