[Documentation] Expand the current studio page

[ShalokShalom]

Expand the current studio page: https://www.habitat.sh/docs/concepts-studio/

0. I think it's senseful to explain the fact, that different studios get created when entered in different places, plus its own pros and cons.

1. I think it's more useful to create one directory where all plans take place and I create one studio there. Under the line, this is the most KISS solution I can think about. See also this issue here in relation: [Feature] to select from different plans at build #2556

2. Explain that the studio is a chroot on Linux and a Docker container in OSX/Windows, plus what this means for the users

3. Explain how to kill a chroot/Docker studio and why

4. Document baseimage, busybox and stage1, the studio types

[eeyun]

This issue is very similar in scope to #2585 closing this issue in support of that. Lets bundle the studio documentation issue into a single scoped piece of work.

[reset]

Duplicate of #2882