Align account_do with core localization structure

Add CreateChart defaults for the Dominican receivable and payable accounts, following the pattern used by official Tryton localization modules.

Register the chart wizard extension, add core-style documentation files, and protect the structure with transactional and static tests.

doc/index.rst

@@ -4,6 +4,14 @@ Account DO
 The ``account_do`` module provides Dominican Republic accounting data for
 Tryton.
 
+.. toctree::
+   :maxdepth: 2
+
+   design
+   reference
+   publishing
+   releases
+
 It includes:
 
 * An IFRS-oriented chart of accounts for Dominican companies;