Update eZ Publish to eZ Platform

A bit overdue update, so updated several parts of the text a bit while at it.

Review/input welcome, just comment inline.

Author: andrerom

projects/ezplatform.yml

@@ -0,0 +1,11 @@
+name: eZ Platform
+url: https://ezplatform.com/
+dependencies:
+    - https://github.com/ezsystems/ezplatform/blob/master/composer.json
+    - https://github.com/ezsystems/ezplatform-ee/blob/master/composer.json
+description: |
+    The eZ Platform, as of v2 a pure full stack Symfony CMS, is the foundation
+    for the eZ Platform  Enterprise Edition, which is built for business-critical
+    digital applications that need to be extensively quality-assured, stable and
+    fully-featured with additional value-added functionalities, support and
+    maintenance services.