Prep for v4.2.0 release

- Move 4.1 docs to 4.2
- Update versions everywhere to 4.1.3 with release script
- Manually bump the shorthand version in package.json
- Add 4.2 to the versions docs page
- Update some redirects
- Fix tests asset URLs
- Bump Nuget and more

site/docs/4.2/content/figures.md

@@ -0,0 +1,28 @@
+---
+layout: docs
+title: Figures
+description: Documentation and examples for displaying related images and text with the figure component in Bootstrap.
+group: content
+---
+
+Anytime you need to display a piece of content—like an image with an optional caption, consider using a `<figure>`.
+
+Use the included `.figure` , `.figure-img` and `.figure-caption` classes to provide some baseline styles for the HTML5 `<figure>` and `<figcaption>` elements. Images in figures have no explicit size, so be sure to add the `.img-fluid` class to your `<img>` to make it responsive.
+
+{% capture example %}
+<figure class="figure">
+  {% include icons/placeholder.svg width="400" height="300" class="figure-img img-fluid rounded" %}
+  <figcaption class="figure-caption">A caption for the above image.</figcaption>
+</figure>
+{% endcapture %}
+{% include example.html content=example %}
+
+Aligning the figure's caption is easy with our [text utilities]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/text/#text-alignment).
+
+{% capture example %}
+<figure class="figure">
+  {% include icons/placeholder.svg width="400" height="300" class="figure-img img-fluid rounded" %}
+  <figcaption class="figure-caption text-right">A caption for the above image.</figcaption>
+</figure>
+{% endcapture %}
+{% include example.html content=example %}