[IMP] website: change CTA based on website main objective

If user selects 'schedule appointments' as main objective in the configurator
and if the website_calendar module is installed then the Call To Action of
snippets s_banner, s_cover and s_call_to_action is changed to 'Schedule an
appointment' and redirect user to '/calendar' on click.

task-2518565

closes odoo/design-themes#5

Related: odoo/odoo#71162
Related: odoo/enterprise#18690
Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

theme_bistro/views/snippets/s_cover.xml

@@ -18,7 +18,7 @@
         </xpath>
         <!-- Button -->
         <xpath expr="//a[hasclass('btn')]" position="replace">
-            <a href="#" class="btn btn-lg btn-primary rounded-circle mb-2">Menu</a>
+            <a t-att-href="cta_btn_href" class="btn btn-lg btn-primary rounded-circle mb-2"><t t-esc="cta_btn_text">Menu</t></a>
         </xpath>
         <!-- Scroll Down button -->
         <xpath expr="//div[hasclass('container')]" position="after">