Promoted Items - how it should work, and what is there now

[left23]

Hi everyone,

Again on @e0ipso's prompt, I am adding this issue here so we can have a wider discussion, as this might be applicable to all consumers.

See https://www.drupal.org/files/issues/1%20-%20Umami%20Front%20wirefame%20v4.png
and http://umami.emc23.com (contenta_ember demo - WIP)

Note the first element: the Promoted Items. The first item has "Our recipe pick", and then "type" on the second and third item.

*In order to test this properly in your consumer, you can use http://contenta.eclecticmeme.com source. Only a few nodes are set as promoted here, whereas http://live-contentacms.pantheonsite.io has most nodes promoted. Both data sources are subject to change.

What we have now:

Currently http://live-contentacms.pantheonsite.io has only Recipe and Article (with only one piece of content) content types. I am assuming article is the same as feature, for now.

Contenta_ember-specific details:
More here: contentacms/contenta_ember#4

1. This element is the index.hbs, meaning it is in the content outlet area of the app i.e. It is the frontpage content
2. For the items loops, I use .firstObject and assign it a different component (just for the template file, because it's only markup) so I can achieve a different layout (title above image and 50% width).
3. FilterByPromoted action is currently limited to recipes content type.

This is how I think that area should work:

1. Need to access articles, recipes, and maybe other (or all) content types. Depends whether the criteria is type-specific, or only that a node has the promoted flag. More info here: https://github.com/contentacms/contenta_jsonapi/blob/8.x-1.x/docs/demos-consumers-implementation-guidelines.md#front-page
2. Nice to have - This should be a feature that can be added anywhere i.e. not limited to the frontpage content