docs: Simplify javascript link modification for external references

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/_layouts/default.html

@@ -121,8 +121,7 @@
 
   <!-- Javascript to automatically fix links to files outside docs/ -->
   <script>
-    $("a[href^='../']")
-      .each(function () {
+  $('.markdown-body').find('a[href^="../"]').each(function() {
     this.href = $(this).attr("href").replace(/^\.\./, "https://github.com/KevinOConnor/klipper/blob/master");
   });
   </script>