-<script src="{{ site.github.url }}/assets/js/jquery.min.js"></script>
-<script src="{{ site.github.url }}/assets/js/bootstrap.min.js"></script>
-<script src="{{ site.github.url }}/assets/js/lesson.js"></script>
+<script src="{{ site.github.url | replace_first: 'http:', 'https:' }}/assets/js/jquery.min.js"></script>
+<script src="{{ site.github.url | replace_first: 'http:', 'https:' }}/assets/js/bootstrap.min.js"></script>
+<script src="{{ site.github.url | replace_first: 'http:', 'https:' }}/assets/js/lesson.js"></script>