Fix opengraph data

Author: ksuess

docs/conf.py

@@ -183,9 +183,9 @@
 
 # -- OpenGraph configuration ----------------------------------
 
-ogp_site_url = "https://docs.plone.org/"
+ogp_site_url = "https://6.dev-docs.plone.org/"
 ogp_description_length = 200
-ogp_image = "https://docs.plone.org/_static/Plone_logo_square.png"
+ogp_image = "https://6.dev-docs.plone.org/_static/Plone_logo_square.png"
 ogp_site_name = "Plone Documentation"
 ogp_type = "website"
 ogp_custom_meta_tags = [