Fixed sticky title and author hover JS (#629)

no issue

- replaces author hover JS that was lost during merge
- replaces `floating-header.js` with `sticky-nav-title.js` containing the relevant JS that was lost during merge with a cleanup for unused variables and unnecessary event listeners
- removes reference to non-existent `{{> floating-header}}` partial

post.hbs

@@ -173,17 +173,42 @@ into the {body} of the default.hbs template --}}
     </div>
 </aside>
 
-{{!-- Floating header which appears on-scroll, included from includes/floating-header.hbs --}}
-{{!-- {{> floating-header}} --}}
-
 {{/post}}
 
 {{!-- The #contentFor helper here will send everything inside it up to the matching #block helper found in default.hbs --}}
 {{#contentFor "scripts"}}
 <script>
     $(document).ready(function () {
+        // FitVids - start
         var $postContent = $(".post-full-content");
         $postContent.fitVids();
+        // FitVids - end
+
+        // Replace nav with title on scroll - start
+        Casper.stickyNavTitle({
+            navSelector: '.site-nav-main',
+            titleSelector: '.post-full-title',
+            activeClass: 'nav-post-title-active'
+        });
+        // Replace nav with title on scroll - end
+
+        // Hover on avatar
+        var hoverTimeout;
+        $('.author-list-item').hover(function () {
+            var $this = $(this);
+
+            clearTimeout(hoverTimeout);
+
+            $('.author-card').removeClass('hovered');
+            $(this).children('.author-card').addClass('hovered');
+
+        }, function () {
+            var $this = $(this);
+
+            hoverTimeout = setTimeout(function () {
+                $this.children('.author-card').removeClass('hovered');
+            }, 800);
+        });
     });
 </script>
 {{/contentFor}}