[BREAKING] Change Config.Server.Documents type

[]string -> map[string]string

Add DisplayName object to use in documentation-html render

examples/config/agecem-org.yaml

@@ -35,8 +35,10 @@ server:
     #
     # Also used to specify which buckets are to be created on receiving a POST request on /v1/seed
     buckets:
-      - 'proces-verbaux'
-      - 'politiques-et-reglements'
+      'proces-verbaux': 'Procès-verbaux'
+      'politiques': 'Politiques'
+      'reglements': 'Règlements'
+      'formulaires': 'Formulaires'
 
   api:
     # Enable or disable key auth on /v1 routes