Allow adding JavaScript files after the theme's (mmistakes#2116)

Allow adding JavaScript files after those bundled in the theme

Close mmistakes#2110

_includes/scripts.html

@@ -26,3 +26,14 @@
 
 {% include analytics.html %}
 {% include /comments-providers/scripts.html %}
+
+{% if site.after_footer_scripts %}
+  {% for script in site.after_footer_scripts %}
+    {% if script contains "://" %}
+      {% capture script_path %}{{ script }}{% endcapture %}
+    {% else %}
+      {% capture script_path %}{{ script | relative_url }}{% endcapture %}
+    {% endif %}
+    <script src="{{ script_path }}"></script>
+  {% endfor %}
+{% endif %}

docs/_docs/17-javascript.md

@@ -2,7 +2,7 @@
 title: "JavaScript"
 permalink: /docs/javascript/
 excerpt: "Instructions for customizing and building the theme's scripts."
-last_modified_at: 2018-01-03T19:12:35-05:00
+last_modified_at: 2019-04-03T15:25:36-04:00
 ---
 
 The theme's `assets/js/main.min.js` script is built from several vendor, jQuery plugins, and other scripts found in [`assets/js/`](https://github.com/mmistakes/minimal-mistakes/tree/master/assets/js).
@@ -39,6 +39,8 @@ head_scripts:
   - /assets/js/your-custom-head-script.js
 footer_scripts:
   - /assets/js/your-custom-footer-script.js
+after_footer_scripts:
+  - /assets/js/custom-script-loads-after-footer.js
 ```
 
 **Note:** If you assign `footer_scripts` the theme's `/assets/js/main.min.js` file will be deactivated. This script includes jQuery and various other plugins that you'll need to find replacements for and include separately.