[IMP] theme_*: improve SEO by correcting heading tag hierarchy

* anelusia, artists, avantgarde, aviato, beauty, bewise, bistro,
bookstore, buzzy, clean, cobalt, enark, graphene, kea, kiddo, loftspace,
monglia, nano, notes, odoo_experts, orchid, paptic, real estate,
treehouse, vehicle, yes, zap

This commit adapts all the `xpath` expressions inside design themes to
target the new heading tags that were changed within the snippet files.

task-4349019

closes odoo/design-themes#1043

Related: odoo/odoo#191300
Related: odoo/enterprise#92978
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

theme_real_estate/views/snippets/s_call_to_action.xml

@@ -5,7 +5,7 @@
     <xpath expr="//section" position="attributes">
         <attribute name="class" remove="o_cc5" add="o_cc3" separator=" "/>
     </xpath>
-    <xpath expr="//h3" position="replace" mode="inner">
+    <xpath expr="//h2" position="replace" mode="inner">
         Want To Become A Real Estate Agent?
     </xpath>
     <xpath expr="//p" position="replace" mode="inner">

theme_real_estate/views/snippets/s_card_offset.xml

@@ -15,7 +15,7 @@
         <attribute name="src">/web/image/website.library_image_16</attribute>
     </xpath>
     <!-- Title -->
-    <xpath expr="//h3" position="replace" mode="inner">
+    <xpath expr="//h2" position="replace" mode="inner">
         Real Estate Solutions for You
     </xpath>
     <!-- Paragraph 1 -->

theme_real_estate/views/snippets/s_cards_grid.xml

@@ -3,32 +3,32 @@
 
     <template id="s_cards_grid" inherit_id="website.s_cards_grid">
         <!-- Title -->
-        <xpath expr="//h3" position="replace" mode="inner">
+        <xpath expr="//h2" position="replace" mode="inner">
             Explore Our Featured Properties
         </xpath>
         <!-- Card 1 -->
-        <xpath expr="(//h5)[1]" position="replace" mode="inner">
+        <xpath expr="(//h3)[1]" position="replace" mode="inner">
             Spacious Urban Loft
         </xpath>
         <xpath expr="(//p)[1]" position="replace" mode="inner">
             Experience city living at its finest in this expansive urban loft, featuring high ceilings, open-plan living spaces, and modern finishes, all in a prime location.
         </xpath>
         <!-- Card 2 -->
-        <xpath expr="(//h5)[2]" position="replace" mode="inner">
+        <xpath expr="(//h3)[2]" position="replace" mode="inner">
             Charming Suburban Home
         </xpath>
         <xpath expr="(//p)[2]" position="replace" mode="inner">
             Enjoy the comfort of this delightful suburban home with a spacious yard, cozy interior, and family-friendly neighborhood, perfect for making lasting memories.
         </xpath>
         <!-- Card 3 -->
-        <xpath expr="(//h5)[3]" position="replace" mode="inner">
+        <xpath expr="(//h3)[3]" position="replace" mode="inner">
             Luxurious Waterfront Villa
         </xpath>
         <xpath expr="(//p)[3]" position="replace" mode="inner">
             Indulge in opulence with this stunning waterfront villa, boasting panoramic views, a private pool, and exquisite design elements that offer a serene and exclusive living experience.
         </xpath>
         <!-- Card 4 -->
-        <xpath expr="(//h5)[4]" position="replace" mode="inner">
+        <xpath expr="(//h3)[4]" position="replace" mode="inner">
             Contemporary Penthouse
         </xpath>
         <xpath expr="(//p)[4]" position="replace" mode="inner">

theme_real_estate/views/snippets/s_three_columns.xml

@@ -17,10 +17,10 @@
     <xpath expr="//div[hasclass('card')]" position="attributes">
         <attribute name="style">border-radius: 0px !important;</attribute>
     </xpath>
-    <xpath expr="//h5" position="before">
+    <xpath expr="//h2" position="before">
         <p class="h4-fs">$295,000</p>
     </xpath>
-    <xpath expr="//h5" position="replace" mode="inner">
+    <xpath expr="//h2" position="replace" mode="inner">
         House On The Hill
     </xpath>
     <xpath expr="//p[hasclass('card-text')]" position="replace" mode="inner">
@@ -34,10 +34,10 @@
     <xpath expr="(//div[hasclass('card')])[2]" position="attributes">
         <attribute name="style">border-radius: 0px !important;</attribute>
     </xpath>
-    <xpath expr="(//h5)[2]" position="before">
+    <xpath expr="(//h2)[2]" position="before">
         <p class="h4-fs">$1,295,000,000</p>
     </xpath>
-    <xpath expr="(//h5)[2]" position="replace" mode="inner">
+    <xpath expr="(//h2)[2]" position="replace" mode="inner">
         Moutain View
     </xpath>
     <xpath expr="(//p[hasclass('card-text')])[2]" position="replace" mode="inner">
@@ -51,10 +51,10 @@
     <xpath expr="(//div[hasclass('card')])[3]" position="attributes">
         <attribute name="style">border-radius: 0px !important;</attribute>
     </xpath>
-    <xpath expr="(//h5)[3]" position="before">
+    <xpath expr="(//h2)[3]" position="before">
         <p class="h4-fs">$455,000</p>
     </xpath>
-    <xpath expr="(//h5)[3]" position="replace" mode="inner">
+    <xpath expr="(//h2)[3]" position="replace" mode="inner">
         Paradise Residence
     </xpath>
     <xpath expr="(//p[hasclass('card-text')])[3]" position="replace" mode="inner">