_includes: Remove eval.liquid, split.liquid dependencies

_includes/eval.liquid

-{% capture eval_workspace %}
-  {% comment %}
-    Evaluate Liquid tags stored in plaintext.
-
-    Supports:
-      `link` tag for site.pages. Does not raise errors on invalid links.
-
-    Parameters:
-      `content` (string): String containing Liquid tags.
-  {% endcomment %}
-
-  {% capture tags %}{{ "{%|" }}%}{% endcapture %}
-  {% assign tags = tags | split: "|" %}
-
-  {% assign join = "|" %}
-  {% capture parts %}{% include split.liquid content=include.content queries=tags join=join %}{% endcapture %}
-  {% assign parts = parts | split: join %}
-
-  {% assign result = "" %}
-  {% for part in parts %}
-    {% assign subparts = part | split: " " %}
-    {% assign rest = subparts | slice: 1, subparts.size | join: " " %}
-    {% case subparts[0] %}
-      {% when "link" %}
-        {% comment %}
-          Jekyll 4.0 supports Liquefied link tags: https://github.com/jekyll/jekyll/pull/6269
-        {% endcomment %}
-        {% for page in site.pages %}
-          {% if page.path == rest %}
-            {% assign link = page.url | relative_url %}
-            {% assign result = result | append: link %}
-          {% endif %}
-        {% endfor %}
-      {% else %}
-        {% assign result = result | append: part %}
-    {% endcase %}
-  {% endfor %}
-{% endcapture %}{% assign eval_workspace = '' %}{{ result }}

_includes/split.liquid

-{% capture split_workspace %}
-  {% comment %}
-    Split the string on all of the delimiters and join the result.
-
-    Parameters:
-      `content` (string): String to split.
-      `delimiters` (array of strings): Boundary strings defining what to split.
-      `join` (string): Join the resulting parts on this string.
-  {% endcomment %}
-
-  {% assign queries = include.queries | default: empty %}
-  {% assign join = include.join | default: "|" %}
-  {% if queries.size == 0 %}
-    {% assign result = include.content %}
-  {% else %}
-    {% assign result = include.content | split: queries[0] | join: join %}
-    {% assign rest = queries | slice: 1, queries.size %}
-    {% for query in rest %}
-      {% assign temp = result | split: join %}
-      {% assign result = "" %}
-      {% for part in temp %}
-        {% assign split = part | split: query %}
-        {% for subpart in split %}
-          {% comment %}
-            Suppress repeated delimiters (empty strings).
-          {% endcomment %}
-          {% if subpart != "" %}
-            {% assign result = result | append: join | append: subpart %}
-          {% endif %}
-        {% endfor %}
-      {% endfor %}
-    {% endfor %}
-  {% endif %}
-{% endcapture %}{% assign split_workspace = '' %}{{ result }}