Added standard bundle installation instructions

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | -
| Fixed tickets | #4157

Note: if you think that this draft is awful, please say it so and we'll rewrite it from scratch.
Well, I think you can copy-paste code-blocks directly, no ? It shoud look like a code-block containing markdown in the website, not as raw text in the middle of the HTML (which would look awful).

``..raw`` is about providing the HTML content of the page directly. This is not what you want here. What you want is a snippet of rST or Markdown code