Add top level _index.md and install.md for non-latest redisvl releases (#2030)

Author: paoloredis

.github/workflows/redisvl_docs_sync.yaml

@@ -279,6 +279,8 @@ jobs:
           else
             mkdir content/develop/ai/redisvl/${version}/
             cp -r redis_vl_hugo/* content/develop/ai/redisvl/${version}/
+            cp content/develop/ai/redisvl/_index.md content/develop/ai/redisvl/${version}/_index.md
+            cp content/develop/ai/redisvl/install.md content/develop/ai/redisvl/${version}/install.md
             python3 build/version_archiver.py redisvl ${version} --skip-archive
           fi