Merge branch '3517421-simplify-composer-json' into '2.x'

Issue #3517421: Simplify composer.json

See merge request !36

composer.json

 {
     "name": "drupal/structure_sync",
-    "description": "Tool for syncing structural data that is stored as content.",
-    "type": "drupal-module",
-    "license": "GPL-2.0-or-later",
-    "homepage": "https://www.drupal.org/project/structure_sync",
+    "description": "Captures blocks, menu-items, and taxonomy terms (elements that are considered content by the Drupal CMS) as configuration, so that they can be synchronized with other configuration.",
     "require": {
         "php": ">=7.1"
     },