[REL] freeze 16.0 branch

conf.py

@@ -22,7 +22,7 @@ copyright = 'Odoo S.A.'
 # `version` if the version info for the project being documented, acts as replacement for |version|,
 # also used in various other places throughout the built documents.
 # `release` is the full version, including alpha/beta/rc tags. Acts as replacement for |release|.
-version = release = 'master'
+version = release = '16.0'
 
 # The minimal Sphinx version required to build the documentation.
 needs_sphinx = '3.0.0'
@@ -186,6 +186,7 @@ sphinx.transforms.i18n.docname_to_domain = (
 # The version names that should be shown in the version switcher, if the config option `versions`
 # is populated. If a version is passed to `versions` but is not listed here, it will not be shown.
 versions_names = {
+    '16.0': "Odoo 16",
     'master': "Master",
     'saas-15.2': "Odoo Online",
     '15.0': "Odoo 15",