Moved repository layout to be based on 3 stage workflow and stacks

Moved layout from flat structure to more nested:

|---- faq.md
|---- published.md
|---+ published
|----   + c-c++
|----   + ruby-ruby-on-rails
|----   + python
|----   +   + guide-1
|----   +       article.md
|----   +       details.json
|
|---- in-review.md
|---+ in-review
|----   + c-c++
|----   +   + guide-2
|----   +       article.md
|----   +       details.json
|----   + ruby-ruby-on-rails
|----   + python
|
|---- draft.md
|---+ draft
|----   + c-c++
|----   + ruby-ruby-on-rails
|----   +   + guide-3
|----   +       article.md
|----   +       details.json
|----   + python