install bootstrap via composer

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+---
+layout: docs
+title: Image replacement
+description: Swap text for background images with the image replacement class.
+group: utilities
+toc: true
+---
+
+{% capture callout %}
+##### Warning
+The `text-hide()` class and mixin has been deprecated as of v4.1. It will be removed entirely in v5.
+{% endcapture %}
+{% include callout.html content=callout type="warning" %}
+
+Utilize the `.text-hide` class or mixin to help replace an element's text content with a background image.
+
+{% highlight html %}
+<h1 class="text-hide">Custom heading</h1>
+{% endhighlight %}
+
+{% highlight scss %}
+// Usage as a mixin
+.heading {
+  @include text-hide;
+}
+{% endhighlight %}
+
+Use the `.text-hide` class to maintain the accessibility and SEO benefits of heading tags, but want to utilize a `background-image` instead of text.
+
+{% capture example %}
+<h1 class="text-hide" style="background-image: url('/docs/{{ site.docs_version }}/assets/brand/bootstrap-solid.svg'); width: 50px; height: 50px;">Bootstrap</h1>
+{% endcapture %}
+{% include example.html content=example %}