Add a link to the data consent page in the main navigation (#109)

Author: ahukkanen

en/modules/ROOT/nav.adoc

@@ -10,6 +10,7 @@
 ** xref:customize:index.adoc[Customize]
 *** xref:customize:authorizations.adoc[Authorizations]
 *** xref:customize:code.adoc[Code]
+*** xref:customize:data_consent.adoc[Data consent]
 *** xref:customize:gemfile.adoc[Gemfile]
 *** xref:customize:images.adoc[Images]
 *** xref:customize:javascript.adoc[Javascript]