build: remove toc-status

_includes/toc-status.html

@@ -1,10 +0,0 @@
-{% comment %}
-  Determine TOC state and return it through variable "enable_toc"
-{% endcomment %}
-
-{% assign enable_toc = false %}
-{% if site.toc and page.toc %}
-  {% if page.content contains '<h2' or page.content contains '<h3' %}
-    {% assign enable_toc = true %}
-  {% endif %}
-{% endif %}