Update transparency parent page

docs/en/modules/admin/pages/features/transparency_features.adoc

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+= Transparency features
+
+== Understand the basics
+
+This documentation section is about features related to the transparency policy of Decidim. 
+Transparency is really important in Decidim, and is one of the main part of xref:understand:social-contract#_transparency_traceability_and_integrity.adoc[Decidim Social Contract]. 
+
+Here, you'll find: 
+
+. xref:admin:features/transparency/statistics.adoc[Statistics]
+. xref:admin:features/transparency/versions.adoc[Versions]
+. xref:admin:features/transparency/fingerprint.adoc[Fingerprint]