[IMP] theme_buzzy, *: fix header hierarchy for better SEO

*: theme_nano, theme_real_estate

Refactored design-themes modules templates to use a consistent and
semantically correct heading structure (h1, h2 etc.). This improves SEO.

task-4680875

closes #1105

Related: odoo/odoo#205011
Related: odoo/enterprise#88051
Related: odoo/upgrade#7927
Signed-off-by: Benjamin Vray (bvr) <[email protected]>

Author: SergeBayet

theme_buzzy/views/new_page_template.xml

@@ -299,7 +299,7 @@
     </xpath>
 </template>
 
-<template id="new_page_template_gallery_s_text_block_h2" inherit_id="website.new_page_template_gallery_s_text_block_h2">
+<template id="new_page_template_gallery_s_text_block_h1" inherit_id="website.new_page_template_gallery_s_text_block_h1">
     <!-- Shape option -->
     <xpath expr="//section" position="attributes">
         <attribute name="class" add="o_cc4 pt80 pb80" remove="o_cc2 pt40 pb0" separator=" "/>

theme_nano/views/new_page_template.xml

@@ -300,7 +300,7 @@
     </xpath>
 </template>
 
-<template id="new_page_template_gallery_s_text_block_h2" inherit_id="website.new_page_template_gallery_s_text_block_h2">
+<template id="new_page_template_gallery_s_text_block_h1" inherit_id="website.new_page_template_gallery_s_text_block_h1">
     <xpath expr="//section" position="attributes">
         <attribute name="class" add="pb0" remove="pb96" separator=" "/>
     </xpath>

theme_real_estate/views/new_page_template.xml

@@ -142,7 +142,7 @@
     </xpath>
 </template>
 
-<template id="new_page_template_gallery_s_text_block_h2" inherit_id="website.new_page_template_gallery_s_text_block_h2">
+<template id="new_page_template_gallery_s_text_block_h1" inherit_id="website.new_page_template_gallery_s_text_block_h1">
     <xpath expr="//section" position="attributes">
         <attribute name="class" remove="o_cc4" separator=" "/>
     </xpath>