[Feature request] Strip module-path components from the front of generated docs

[ELLIOTTCABLE]

I'd love the ability to "leave out" chunks of the module-path.

For example, in a project named bs-slash-create, BuckleScript by default 'namespaces' the project's modules underneath a module of the same name, SlashCreate. In simple projects with only one root module, this can result in a doubled module-path, i.e. SlashCreate.SlashCreate.

When running bsdoc build SlashCreate in such a project, a directory-structure like this is produced:

./bs-slash-create $ tree docs
docs
└── SlashCreate
    └── SlashCreate
        ...
        ├── SlashCommand
        │   ├── Option
        │   │   └── index.html
        │   └── index.html
        ├── SlashCreator
        │   └── index.html
        ├── User
        │   └── index.html
        ├── UserFlags
        │   └── index.html
        └── index.html

When published to GitHub Pages, this results in URLs like:

https://by.elliottcable.name/bs-slash-create/SlashCreate/SlashCreate/index.html

Ideally, bsdoc would allow me to explicitly strip particular components, and then discard any modules that are inaccessible by the newly-stripped path (i.e. bsdoc build SlashCreate --strip SlashCreate.SlashCreate producing SlashCommand, User, etc at the top-level of the docs.)

Alternatively, at the least, it'd be nice if bsdoc respected the "namespace" field in bsconfig.json:

{
   "$schema": "https://raw.githubusercontent.com/rescript-lang/rescript-compiler/master/docs/docson/build-schema.json",
   "name": "bs-slash-create",
   "namespace": false,
   "sources": [{
      "dir": "src",
      "subdirs": true
   }],
   // ...

... and didn't produce an additional top-level SlashCreate when that is thusly configured.