Choose/Skip Layers during Install
### Is your feature request related to a problem? Please describe..

Hi, long-time Vimmer here considering moving to Nvim and abandoning my carefully handcrafted (awful) config, which is why I'm looking at SpaceVim as an IDE-lite distribution.

When installing for the first time in a container (to avoid potentially interfering with my current setup), it installs _everything_, from what I can see, for every potential layer. I looked through install.sh and the docs and didn't see a way to disable some of this. The end result is that I spent over 10 minutes building the image, and it's almost a gig, while I'm not even sure if I'm going to use SpaceVim. Assuming SpaceVim doesn't need dependencies of every layer to be installed, it should be configurable up front.

### Describe the solution you'd like.

A prompt during installation to figure out what layers to config and install deps for. This could be done with `expect(1)` or something similar. I'm not sure if there's some logic for this in how layers are loaded after config is parsed, but even if there is, it would be nice to have it up front for people (like me) who haven't used SpaceVim before.

### Additional context

Sidenote, if the workflow is adapted to use `with: platforms: 'arm'` (and any others that seem relevant) and `TARGETARCH` and some other minor changes in the Dockerfile, you could build multi-arch images so folks don't need to build their own for other architectures (I'm on `linux/arm64/v8`).