chore: remove h1 element from site title (cotes2020#1960)

Author: kungfux

_includes/sidebar.html

@@ -11,9 +11,7 @@
       {%- endif -%}
     </a>
 
-    <h1 class="site-title">
-      <a href="{{ '/' | relative_url }}">{{ site.title }}</a>
-    </h1>
+    <a class="site-title d-block" href="{{ '/' | relative_url }}">{{ site.title }}</a>
     <p class="site-subtitle fst-italic mb-0">{{ site.tagline }}</p>
   </header>
   <!-- .profile-wrapper -->

_sass/addon/commons.scss

@@ -738,20 +738,18 @@ $btn-mb: 0.5rem;
   }
 
   .site-title {
+    @extend %clickable-transition;
+    @extend %sidebar-link-hover;
+
     font-family: inherit;
     font-weight: 900;
     font-size: 1.75rem;
     line-height: 1.2;
     letter-spacing: 0.25px;
     margin-top: 1.25rem;
     margin-bottom: 0.5rem;
-
-    a {
-      @extend %clickable-transition;
-      @extend %sidebar-link-hover;
-
-      color: var(--site-title-color);
-    }
+    width: fit-content;
+    color: var(--site-title-color);
   }
 
   .site-subtitle {