Don't skip heading levels

But we still style it a bit smaller than default.

app/templates/app/home.html

@@ -7,7 +7,7 @@
 <h1 id="main-heading" class="visually-hidden">{% trans "Home page" %}</h1>
 <section class="m-3 card">
    <div class="card-body limit-text-width">
-       <h5 class="card-title">{% trans "Welcome" %}</h5>
+       <h2 class="fs-3 card-title">{% trans "Welcome" %}</h2>
        <p>
            {% blocktrans trimmed %}
                The South African Centre for Digital Language Resources (SADiLaR) is a national research
@@ -36,7 +36,7 @@ <h5 class="card-title">{% trans "Welcome" %}</h5>
 <section class="m-3 card">
    <div class="card-body d-flex justify-content-between align-items-end">
        <div class="card-items">
-           <h5 class="card-title">{% trans "Search" %}</h5>
+           <h2 class="fs-3 card-title">{% trans "Search" %}</h2>
            <p>
                {% blocktrans trimmed %}
                    This platforms hosts terminology and other useful language resources.
@@ -55,7 +55,7 @@ <h5 class="card-title">{% trans "Search" %}</h5>
 
 <section class="m-3 card">
     <div class="card-body">
-        <h5 class="card-title">{% trans "Explore" %}</h5>
+        <h2 class="fs-3 card-title">{% trans "Explore" %}</h2>
         <p>
             {% trans "Browse through the available information by one of the following categories:" %}
         </p>