Adapt "Drupal 7 Deconstructed" material for Backdrop and make available

[yorkshire-pudding]

If you look at the (#Backdrop > Documentation @ 💬) thread in Zulip, you'll see we explored the idea of adapting the Drupal 7 Deconstructed content for Backdrop CMS and making it available.

We asked for and were granted permission to use the material: drupal-deconstructed/drupal-7-deconstructed#39 (comment)

Now we need to follow through and use it.

Should this go in the docs site? If so, where?

If not, where should we put it?

[yorkshire-pudding]

Someone has already forked it to https://github.com/backdrop-ops/backdrop-guide
We will start converting the content there, but then will look at adding to the docs site.

Currently thinking about under the "Developing for Backdrop" section, perhaps titled "Understanding how Backdrop works"