js: fix smoothscroll header offset, fix changing URL

Author: Samir-Rashid

assets/js/_main.js

@@ -84,7 +84,10 @@ $(document).ready(function () {
   });
 
   // init smooth scroll, this needs to be slightly more than then fixed masthead height
-  $("a").smoothScroll({ offset: -65 });
+  $("a").smoothScroll({ 
+    offset: -75, // needs to match $masthead-height
+    preventDefault: false,
+  }); 
 
   // add lightbox class to all image links
   $("a[href$='.jpg'],a[href$='.jpeg'],a[href$='.JPG'],a[href$='.png'],a[href$='.gif']").addClass("image-popup");