Replace base_path with absolute_url filter where possible

_includes/sidebar.html

@@ -1,5 +1,3 @@
-{% include base_path %}
-
 {% if page.author_profile or layout.author_profile or page.sidebar %}
   <div class="sidebar sticky">
   {% if page.author_profile or layout.author_profile %}{% include author-profile.html %}{% endif %}
@@ -10,7 +8,7 @@
         {% if s.image contains "://" %}
           "{{ s.image }}"
         {% else %}
-          "{{ s.image | prepend: "/" | prepend: base_path }}"
+          "{{ s.image | prepend: "/" | absolute_url }}"
         {% endif %}
         alt="{% if s.image_alt %}{{ s.image_alt }}{% endif %}">
       {% endif %}