Improve setup documentation for new landscapes

This looks like a really useful app, but it seems quite difficult to get started to create a new landscape.

- The instructions could be bullet points
- Perhaps less dependency tools (`nvm`, `npm`, `yarn`, etc..), and less chained scripts

I'd be happy to contribute to documenting the steps, but I'm really struggling to make a simple landscape (even copying others such as _lfai-landscape_ or _graphql-landscape_.

Is anyone able to give me some pointers? Ideally the setup should be _able_ to be described in a `Dockerfile` for example.