Merging upstream version 5.3.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+---
+layout: docs
+title: Images
+description: Documentation and examples for opting images into responsive behavior (so they never become wider than their parent) and add lightweight styles to them—all via classes.
+group: content
+toc: true
+---
+
+## Responsive images
+
+Images in Bootstrap are made responsive with `.img-fluid`. This applies `max-width: 100%;` and `height: auto;` to the image so that it scales with the parent width.
+
+{{< example >}}
+{{< placeholder width="100%" height="250" class="bd-placeholder-img-lg img-fluid" text="Responsive image" >}}
+{{< /example >}}
+
+## Image thumbnails
+
+In addition to our [border-radius utilities]({{< docsref "/utilities/borders" >}}), you can use `.img-thumbnail` to give an image a rounded 1px border appearance.
+
+{{< example >}}
+{{< placeholder width="200" height="200" class="img-thumbnail" title="A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera" >}}
+{{< /example >}}
+
+## Aligning images
+
+Align images with the [helper float classes]({{< docsref "/utilities/float" >}}) or [text alignment classes]({{< docsref "/utilities/text#text-alignment" >}}). `block`-level images can be centered using [the `.mx-auto` margin utility class]({{< docsref "/utilities/spacing#horizontal-centering" >}}).
+
+{{< example >}}
+{{< placeholder width="200" height="200" class="rounded float-start" >}}
+{{< placeholder width="200" height="200" class="rounded float-end" >}}
+{{< /example >}}
+
+
+{{< example >}}
+{{< placeholder width="200" height="200" class="rounded mx-auto d-block" >}}
+{{< /example >}}
+
+{{< example >}}
+<div class="text-center">
+  {{< placeholder width="200" height="200" class="rounded" >}}
+</div>
+{{< /example >}}
+
+
+## Picture
+
+If you are using the `<picture>` element to specify multiple `<source>` elements for a specific `<img>`, make sure to add the `.img-*` classes to the `<img>` and not to the `<picture>` tag.
+
+```html
+<picture>
+  <source srcset="..." type="image/svg+xml">
+  <img src="..." class="img-fluid img-thumbnail" alt="...">
+</picture>
+```
+
+## CSS
+
+### Sass variables
+
+Variables are available for image thumbnails.
+
+{{< scss-docs name="thumbnail-variables" file="scss/_variables.scss" >}}