Release v5.3.0-alpha1 (#37661)

* Bump version to 5.3.0-alpha1

* Dist

* Add docs versions updates

* Update note in homepage hero

Co-authored-by: Mark Otto <markdotto@gmail.com>

site/content/docs/5.3/helpers/visually-hidden.md

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+---
+layout: docs
+title: Visually hidden
+description: Use these helpers to visually hide elements but keep them accessible to assistive technologies.
+group: helpers
+aliases: "/docs/5.3/helpers/screen-readers/"
+---
+
+Visually hide an element while still allowing it to be exposed to assistive technologies (such as screen readers) with `.visually-hidden`. Use `.visually-hidden-focusable` to visually hide an element by default, but to display it when it's focused (e.g. by a keyboard-only user). `.visually-hidden-focusable` can also be applied to a container–thanks to `:focus-within`, the container will be displayed when any child element of the container receives focus.
+
+{{< example >}}
+<h2 class="visually-hidden">Title for screen readers</h2>
+<a class="visually-hidden-focusable" href="#content">Skip to main content</a>
+<div class="visually-hidden-focusable">A container with a <a href="#">focusable element</a>.</div>
+{{< /example >}}
+
+Both `visually-hidden` and `visually-hidden-focusable` can also be used as mixins.
+
+```scss
+// Usage as a mixin
+
+.visually-hidden-title {
+  @include visually-hidden;
+}
+
+.skip-navigation {
+  @include visually-hidden-focusable;
+}
+```