Ability to host static html/js content

[ajross]

We'd like the ability to host static html and js files so that we can include custom content on our docs site.

The artefacts should be hosted as-is at the path configured in the repository. The use case is where we have a simple tool (single page application) that we want to host at a path within our docs repo. e.g. https://docs.acmecorp.com/my-super-tool
It should not be managed by the mintlify build process - it should just be served up raw.