rms-support-letter.github.io/_includes/signatures.html

<p><b>Signed by {{ site.data.signed.size }} individuals:</b></p>
<ol>
  <!--<li><a href="https://github.com/[1-999][1-999][1-999][1-999]">Spider Trap</a></li>-->
{%- capture signs -%}
  {%- for sign_hash in site.data.signed -%}
    {%- assign signature = sign_hash[1] -%}
    {%- assign name = signature.name | strip -%}
    {%- assign name_order = name | downcase -%}
    {%- assign first_char = name_order | slice: 0 -%}
    {%- assign first_number = first_char | plus: 0 | append: '' -%}
    {%- if first_char == first_number -%}
      {%- assign name_order = name_order | prepend: '~' -%}
    {%- endif -%}
    <array>{{ name_order | escape }}<field>
    <field>{{ name | escape }}<field>
    <field>{{ signature.link | strip | escape }}<field>
  {%- endfor -%}
{%- endcapture -%}
{%- assign sorted_signs = signs | split: '<array>' | sort_natural -%}
{%- for signature in sorted_signs -%}
  {%- assign sign_items = signature | split: '<field>' -%}
  {%- if sign_items[2] and sign_items[4] -%}
  {%- assign name = sign_items[2] -%}
  {%- assign link = sign_items[4] -%}
  {% comment %}Add whitespace{% endcomment %}
  <li><a href="{{ link }}">{{ name }}</a></li>
  {%- endif -%}
{%- endfor -%}
{% comment %}Add whitespace{% endcomment %}
</ol>