Create a Bootstrap navigation in Redaxo
Create the file bootstrap_navigation.php on your server, I suggest here:
/redaxo/src/addons/project/lib/bootstrap_navigation.php
In your template, create the navigation using this code:
<nav class="navbar navbar-expand-md bg-dark navbar-dark">
<!-- Brand -->
<a class="navbar-brand" href="#">Navbar</a>
<!-- Toggler/collapsibe Button -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
<span class="navbar-toggler-icon"></span>
</button>
<!-- Navbar links -->
<div class="collapse navbar-collapse" id="collapsibleNavbar">
<?php
$nav = rex_bootstrap_navigation::factory();
$category_id = 0;
$depth = 4;
$open = true;
$ignore_offlines = true;
echo $nav->get($category_id, $depth, $open, $ignore_offlines);
?>
</div>
</nav>