Nav children don't work correctly

[yavorg]

Describe the bug
After following the structure recommended by the docs, the nav structure doesn't look right:

To Reproduce
Steps to reproduce the behavior using build 0.1.6 of the Gem

• All child pages are in an a integrator-guide subfolder
• The parent page front matter

---
layout: default
title: Integrator Guide
nav_order: 2
has_children: true
permalink: /integrator-guide
---

• Child pages front matter example

---
layout: default
title: Getting Started
parent: Integrator Guide
nav_order: 1
---

• While the left-hand nav is incorrect, if you navigate to the parent page /integrator-guide the TOC generated automatically on that page is correct and does show the right children

Expected behavior
Left nav contains the right children

[yavorg]

This went away by referencing the theme as remote_theme: "pmarsceill/just-the-docs@v0.2.3" in _config.yml. Previously it was referenced in the Gemfile alongside github-pages, which apparently was causing the theme to get downgraded to a much older version.