docs: add v5.0 in versions (#32728)

site/data/docs-versions.yml

@@ -44,3 +44,9 @@
     - v: "4.3"
     - v: "4.4"
     - v: "4.5"
+
+- group: v5.x
+  baseurl: "https://getbootstrap.com/docs"
+  description: "Our next major release."
+  versions:
+    - v: "5.0"

site/layouts/partials/docs-navbar.html

@@ -37,6 +37,8 @@
       <div class="dropdown-menu dropdown-menu-md-right" aria-labelledby="bd-versions">
         <a class="dropdown-item active" href="/docs/{{ .Site.Params.docs_version }}/">Latest (4.5.x)</a>
         <div class="dropdown-divider"></div>
+        <a class="dropdown-item" href="https://getbootstrap.com/docs/5.0/">5.0.x</a>
+        <div class="dropdown-divider"></div>
         <a class="dropdown-item" href="https://getbootstrap.com/docs/3.4/">v3.4.1</a>
         <a class="dropdown-item" href="https://getbootstrap.com/2.3.2/">v2.3.2</a>
         <div class="dropdown-divider"></div>