sections/article.html
Hi there!
You seem to be trying to write a Sphinx theme! Nice!
  What you're seeing is the initial scaffolding provided by sphinx-basic-ng
  which should serve as a decent base for most 3-column layouts.
  If this is the first time you're seeing this, you probably want to be looking at the
  Getting Started
  page in the documentation.
  Every "section" of this page is populated using a template. The name of the template
  is visible in the sections. To override it, create your own template in the same
  path in your templates directory. For example, creating a template named
  sections/article.html will override this section.