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/about/team.md

@@ -0,0 +1,23 @@
+---
+layout: docs
+title: Team
+description: An overview of the founding team and core contributors to Bootstrap.
+group: about
+---
+
+Bootstrap is maintained by the founding team and a small group of invaluable core contributors, with the massive support and involvement of our community.
+
+{{< team.inline >}}
+<div class="list-group mb-3">
+  {{- range (index $.Site.Data "core-team") }}
+    <a class="list-group-item list-group-item-action d-flex align-items-center" href="https://github.com/{{ .user }}">
+      <img src="https://github.com/{{ .user }}.png" alt="@{{ .user }}" width="32" height="32" class="rounded me-2" loading="lazy">
+      <span>
+        <strong>{{ .name }}</strong> @{{ .user }}
+      </span>
+    </a>
+  {{ end -}}
+</div>
+{{< /team.inline >}}
+
+Get involved with Bootstrap development by [opening an issue]({{< param repo >}}/issues/new/choose) or submitting a pull request. Read our [contributing guidelines]({{< param repo >}}/blob/v{{< param current_version >}}/.github/CONTRIBUTING.md) for information on how we develop.