[MOV] website: move the dashboard template for future OWL conversion

Prepare for OWL conversion while keeping the template's history, as
some of its code can be re-used in the new OWL Component.

task-3164163

Part-of: odoo/odoo#112819

addons/website/__manifest__.py

@@ -169,7 +169,6 @@
             'website/static/src/scss/color_palettes.scss',
             'website/static/src/scss/view_hierarchy.scss',
             'website/static/src/scss/website.backend.scss',
-            'website/static/src/xml/website.backend.xml',
             'website/static/src/scss/website_visitor_views.scss',
             'website/static/src/js/backend/**/*',
             'website/static/src/client_actions/*/*',