gh-pages subdirectory files aren't shown up
<p>I have following github page displaying some HTML already: <a href="http://json-schema-faker.github.io/json-schema-faker/" rel="noreferrer">http://json-schema-faker.github.io/json-schema-faker/</a></p>

<p>this is the source repo (<code>gh-pages</code> branch): <a href="https://github.com/json-schema-faker/json-schema-faker/tree/gh-pages" rel="noreferrer">https://github.com/json-schema-faker/json-schema-faker/tree/gh-pages</a></p>

<p>Although top-level directory files work perfectly fine:</p>

<ul>
<li><a href="http://json-schema-faker.github.io/json-schema-faker/index.html" rel="noreferrer">http://json-schema-faker.github.io/json-schema-faker/index.html</a> - <a href="https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/index.html" rel="noreferrer">https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/index.html</a></li>
<li><a href="http://json-schema-faker.github.io/json-schema-faker/globals.html" rel="noreferrer">http://json-schema-faker.github.io/json-schema-faker/globals.html</a> - <a href="https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/globals.html" rel="noreferrer">https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/globals.html</a></li>
</ul>

<p>the lower-level directories files don't work at all, e.g.</p>

<ul>
<li><a href="http://json-schema-faker.github.io/json-schema-faker/modules/_class_container_.html" rel="noreferrer">http://json-schema-faker.github.io/json-schema-faker/modules/_class_container_.html</a> -> <a href="https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/classes/_class_container_.container.html" rel="noreferrer">https://github.com/json-schema-faker/json-schema-faker/blob/gh-pages/classes/_class_container_.container.html</a></li>
</ul>

<p>The files are there, uploaded in the repo in <code>gh-pages</code> branch. What is wrong?</p>