[RFC]: JSON-LD structure

[bidi47]

the json-lm schema and files may need a revision

1. the first part of the schema is identical, only the FAQ is unique
   this justifies a refactor, unless there are better arguments to keep the files as is

• create a single partial that contains the main part of the json-ld schema
• keep the FAQ section of the json-ld in the blogpost twig
• delete all JSON-LD folders

2. the older articles has a different json-ld structure
   compare these 2 twigs:

• android/listen-for-android-install-referrer.jsonld.twig (about 3/4 of the json-ld files have this structure)
• zend-framework/scienta-zf-debug-bar-a-very-helpfull-zf-debug-tool.jsonld.twig