As FontAwesome 5 site states, fa-code-branch icon replaces Font Awesome 4's fa-code-fork.
Just updated two lines, where old class wasn't replaced.
</a>
<a class="panel-block">
<span class="panel-icon">
- <i class="fas fa-code-fork" aria-hidden="true"></i>
+ <i class="fas fa-code-branch" aria-hidden="true"></i>
</span>
daniellowtw/infboard
</a>
<a class="panel-block">
<span class="panel-icon">
- <i class="fas fa-code-fork" aria-hidden="true"></i>
+ <i class="fas fa-code-branch" aria-hidden="true"></i>
</span>
mojs
</a>