Bring back /versions/index.md

PiperOrigin-RevId: 467951462
Change-Id: I1a8a7c2a743a78b61c9596a8b1396ba598a04092

site/en/versions/index.md

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+Project: /_project.yaml
+Book: /_book.yaml
+
+# Documentation Versions
+
+The documentation on this website represents the latest in Bazel. Documentation
+is updated at head. Each major supported release will have a snapshot of the
+narrative and reference documentation that follows the lifecycle of Bazel's
+version support.
+
+For now, to see documentation for older Bazel versions, go to
+[docs.bazel.build](https://docs.bazel.build/).
+
+<a class="button button-with-icon button-primary" href="https://docs.bazel.build/">
+  To the Archives!<span class="material-icons icon-after" aria-hidden="true">arrow_forward</span>
+</a>