Replace anchor.js with jekyll-anchor-headings.

This allows us to generate the anchor links on build time.

https://github.com/allejo/jekyll-anchor-headings

site/_includes/scripts.html

@@ -14,7 +14,6 @@
 {%- if jekyll.environment == "production" -%}
   <script src="{{ site.baseurl }}/docs/{{ site.docs_version }}/assets/js/docs.min.js"></script>
 {%- else -%}
-  <script src="{{ site.baseurl }}/docs/{{ site.docs_version }}/assets/js/vendor/anchor.min.js"></script>
   <script src="{{ site.baseurl }}/docs/{{ site.docs_version }}/assets/js/vendor/clipboard.min.js"></script>
   <script src="{{ site.baseurl }}/docs/{{ site.docs_version }}/assets/js/vendor/holder.min.js"></script>
   <script src="{{ site.baseurl }}/docs/{{ site.docs_version }}/assets/js/vendor/bs-custom-file-input.min.js"></script>

site/_includes/vendor/anchor_headings.html

@@ -0,0 +1,86 @@
+{% capture headingsWorkspace %}
+  {% comment %}
+    Version 1.0.0
+      https://github.com/allejo/jekyll-anchor-headings
+
+    "Be the pull request you wish to see in the world." ~Ben Balter
+
+    Usage:
+      {% include anchor_headings.html html=content %}
+
+    Parameters:
+      * html          (string) - the HTML of compiled markdown generated by kramdown in Jekyll
+
+    Optional Parameters:
+      * beforeHeading (bool)   : false  - Set to true if the anchor should be placed _before_ the heading's content
+      * anchorBody    (string) :  ''    - The content that will be placed inside the anchor; the `%heading%` placeholder is available
+      * anchorClass   (string) :  ''    - The class(es) that will be used for each anchor. Separate multiple classes with a space
+      * anchorTitle   (string) :  ''    - The `title` attribute that will be used for anchors
+      * h_min         (int)    :  1     - The minimum header level to build an anchor for; any header lower than this value will be ignored
+      * h_max         (int)    :  6     - The maximum header level to build an anchor for; any header greater than this value will be ignored
+
+    Output:
+      The original HTML with the addition of anchors inside of all of the h1-h6 headings.
+  {% endcomment %}
+
+  {% assign minHeader = include.h_min | default: 1 %}
+  {% assign maxHeader = include.h_max | default: 6 %}
+  {% assign beforeHeading = include.beforeHeading %}
+  {% assign nodes = include.html | split: '<h' %}
+
+  {% capture edited_headings %}{% endcapture %}
+
+  {% for node in nodes %}
+    {% if node == "" %}
+      {% continue %}
+    {% endif %}
+
+    {% assign headerLevel = node | replace: '"', '' | slice: 0, 1 | times: 1 %}
+
+    <!-- If the node doesn't have a header, then it's content before the first heading; don't discard it -->
+    {% if headerLevel < 1 or headerLevel > 6 %}
+      {% capture edited_headings %}{{ edited_headings }}{{ node }}{% endcapture %}
+      {% continue %}
+    {% endif %}
+
+    {% assign _workspace = node | split: '</h' %}
+    {% assign _idWorkspace = _workspace[0] | split: 'id="' %}
+    {% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
+    {% assign html_id = _idWorkspace[0] %}
+
+    {% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
+    {% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}
+
+    <!-- Build the anchor to inject for our heading -->
+    {% capture anchor %}{% endcapture %}
+
+    {% if html_id and headerLevel >= minHeader and headerLevel <= maxHeader %}
+      {% capture anchor %}href="#{{ html_id}}"{% endcapture %}
+
+      {% if include.anchorClass %}
+        {% capture anchor %}{{ anchor }} class="{{ include.anchorClass }}"{% endcapture %}
+      {% endif %}
+
+      {% if include.anchorTitle %}
+        {% capture anchor %}{{ anchor }} title="{{ include.anchorTitle | replace: '%heading%', header }}"{% endcapture %}
+      {% endif %}
+
+      {% capture anchor %}<a {{ anchor }}>{{ include.anchorBody | replace: '%heading%', header | default: '' | raw }}</a>{% endcapture %}
+
+      {% if beforeHeading %}
+        {% capture anchor %}{{ anchor }} {% endcapture %}
+      {% else %}
+        {% capture anchor %} {{ anchor }}{% endcapture %}
+      {% endif %}
+    {% endif %}
+
+    <!-- The placement of our anchor, before the heading content or after -->
+    {% if beforeHeading %}
+      {% capture _current %}<h{{ _hAttrToStrip | raw }}{{ anchor }}{% endcapture %}
+      {% capture edited_headings %}{{ edited_headings }}{{ node | replace: _hAttrToStrip, _current | raw }}{% endcapture %}
+    {% else %}
+      {% capture _current %}<h{{ _workspace | first }}{{ anchor }}</h{{ _workspace | last }}{% endcapture %}
+      {% capture edited_headings %}{{ edited_headings }}{{ _current }}{% endcapture %}
+    {% endif %}
+  {% endfor %}
+{% endcapture %}{% assign headingsWorkspace = '' %}{{ edited_headings | strip }}