Merge branch 'develop'

* develop:
  Adding drupal/single_content_sync
  Adding drupal/single_content_sync
  OS-104 removing old theme
  Adding ckeditor_a11ychecker

Author: stankut

composer.json

@@ -87,6 +87,7 @@
         "composer/installers": "^1.9",
         "cweagans/composer-patches": "^1.7",
         "drupal/bootstrap": "^3.21",
+        "drupal/ckeditor_a11ychecker": "^3.0",
         "drupal/coc_forms_auto_export": "^2.0@alpha",
         "drupal/color": "^1.0",
         "drupal/core-composer-scaffold": "^10",
@@ -103,6 +104,7 @@
         "drupal/queue_ui": "^3.1",
         "drupal/rdf": "^2.0",
         "drupal/restui": "^1.20",
+        "drupal/single_content_sync": "^1.4",
         "drupal/straw": "^2.0@beta",
         "drupal/telephone_validation": "^2.2",
         "drupal/webform_analysis": "^1.0@beta",