Separate link button and tabs into sections on the links page

src/_includes/main/links.njk

@@ -6,7 +6,12 @@ isContentDivided: true
 {% set linkGroups = collections["link groups"] %}
 
 <section class="content__section">
+    <h2>Link to My Website</h2>
     {% include "main/site-btn.njk" %}
+</section>
+
+<section class="content__section">
+    <h2>Links by Category</h2>
 
     <p>Use the following tabs to view my link collection by category.</p>
     <nav>