[MOV] finance: move fiscal localisation pages and merge /overview/

The content written in the fiscal localisation pages are not only for
Accounting, but also for other apps such as Payroll and Point of Sales.
This commit moves the content to the "Finance" level, to better reflect
this reality, and merges the pages in the /overview/ folder in the main
category page.

closes odoo/documentation#3537

Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>

content/applications/finance/accounting/getting_started/initial_configuration/chart_of_accounts.rst

@@ -185,4 +185,4 @@ To do so, check the :guilabel:`Deprecated` box in the account's settings, and sa
    * :doc:`../../payables/supplier_bills/assets`
    * :doc:`../../payables/supplier_bills/deferred_expenses`
    * :doc:`../../receivables/customer_invoices/deferred_revenues`
-   * :doc:`../../fiscal_localizations/overview/fiscal_localization_packages`
+   * :doc:`../../../fiscal_localizations`

content/applications/finance/accounting/getting_started/initial_configuration/setup.rst

@@ -12,9 +12,8 @@ The settings visible in the onboarding banner can still be modified later by goi
 .. note::
    Odoo Accounting automatically installs the appropriate **Fiscal Localization Package** for your
    company, according to the country selected at the creation of the database. This way, the right
-   accounts, reports, and taxes are ready-to-go. :doc:`Click here
-   <../../fiscal_localizations/overview/fiscal_localization_packages>` for more information about
-   Fiscal Localization Packages.
+   accounts, reports, and taxes are ready-to-go. :ref:`Click here <fiscal_localizations/packages>`
+   for more information about Fiscal Localization Packages.
 
 Accounting onboarding banner
 ============================
@@ -190,5 +189,5 @@ Send yourself a sample invoice by email to make sure everything is correctly con
    * :doc:`../../bank/setup/bank_accounts`
    * :doc:`chart_of_accounts`
    * :doc:`../../bank/feeds/bank_synchronization`
-   * :doc:`../../fiscal_localizations/overview/fiscal_localization_packages`
+   * :doc:`../../../fiscal_localizations`
    * `Odoo Tutorials: Accounting Basics <https://www.odoo.com/r/lsZ>`_