Remove prerelease attribute from component descriptor and add display_version (#12)

Author: recrwplay

antora.yml

@@ -1,7 +1,7 @@
 name: http-api
 title: HTTP API
-version: '4.4-preview'
-prerelease: true
+version: 4.4
+display_version: 4.4-preview
 start_page: ROOT:index.adoc
 nav:
 - modules/ROOT/content-nav.adoc